diff --git a/CHANGELOG.md b/CHANGELOG.md --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -1,5 +1,18 @@ # Releases +## chessIO 0.7.0.0 + +- Remove IsSquare class and add three newtye'd Ints: Square, Rank, File (inspired by [issue 5](https://github.com/mlang/chessIO/issues/5)) +- Add HasCallStack to partial doPly and toSAN (thanks Oleg Grenrus) +- instance IsString Position based on fromFEN +- instance Binary Position +- instance Hashable Position +- instance Binary Ply +- instance Unbox Ply +- New functions: rank, file, rankChar, fileChar, toCoord +- New module: Game.Chess.ECO +- Chess.Game.UCI: PV is now an unboxed vector + ## chessIO 0.6.1.1 - Fix [half-move counter not being reset on pawn push or capture](https://github.com/mlang/chessIO/issues/2) (Thanks to Oleg Grenrus) diff --git a/app/cboard.hs b/app/cboard.hs --- a/app/cboard.hs +++ b/app/cboard.hs @@ -17,7 +17,7 @@ ( fromFEN, fromUCI, isDark, legalPlies, pieceAt, startpos, Color(Black, White), PieceType(King, Pawn, Knight, Bishop, Rook, Queen), - Ply, Position, Sq(H8, A1) ) + Ply, Position, Square(H8, A1) ) import Game.Chess.Polyglot ( PolyglotBook, defaultBook, readPolyglotFile, bookPlies, bookPly ) import Game.Chess.SAN ( fromSAN, toSAN, unsafeToSAN, varToSAN ) diff --git a/app/cbookview.hs b/app/cbookview.hs --- a/app/cbookview.hs +++ b/app/cbookview.hs @@ -1,53 +1,55 @@ {-# LANGUAGE TemplateHaskell #-} -import Prelude hiding (last) -import Control.Monad ( void ) -import Data.Foldable ( foldl', toList ) -import Data.Ix -import Data.List ( elemIndex, intersperse ) -import Data.List.Extra ( chunksOf ) -import Data.List.NonEmpty (NonEmpty) -import qualified Data.List.NonEmpty as NonEmpty -import Data.Maybe ( fromJust, fromMaybe ) -import Data.Tree ( Tree(..), Forest ) -import Data.Tree.Zipper ( TreePos, Full - , label, forest, fromForest, nextTree, prevTree - ) -import qualified Data.Tree.Zipper as TreePos -import qualified Data.Vector as Vec -import Game.Chess ( Color(..), PieceType(..), Sq(..), toIndex, isDark - , Position, color, startpos, pieceAt, toFEN - , Ply, plyTarget, doPly - ) -import Game.Chess.Polyglot ( defaultBook, bookForest, readPolyglotFile ) -import Game.Chess.PGN ( readPGNFile, pgnForest ) -import Game.Chess.SAN ( toSAN, varToSAN ) -import Game.Chess.Tree ( plyForest, pathTree ) -import Lens.Micro ( over, (&), (^.), (.~) ) -import Lens.Micro.TH ( makeLenses ) -import qualified Graphics.Vty as V +import Control.Lens (makeLenses, over, (&), (.~), (^.)) +import Control.Monad (void) +import Data.Foldable (foldl', toList) +import Data.Ix +import Data.List (elemIndex, intersperse) +import Data.List.Extra (chunksOf) +import Data.List.NonEmpty (NonEmpty, cons) +import qualified Data.List.NonEmpty as NonEmpty +import Data.Maybe (fromJust, fromMaybe) +import Data.Tree (Forest, Tree (..), foldTree) +import Data.Tree.Zipper (Full, TreePos, forest, fromForest, label, + nextTree, prevTree) +import qualified Data.Tree.Zipper as TreePos +import qualified Data.Vector as Vec +import Game.Chess (Color (..), PieceType (..), Ply, + Position, Square (A1, H8), color, doPly, + isDark, pieceAt, plyTarget, startpos, + toFEN) +import Game.Chess.ECO (Opening (..), defaultECO) +import qualified Game.Chess.ECO as ECO +import Game.Chess.PGN (pgnForest, readPGNFile) +import Game.Chess.Polyglot (bookForest, defaultBook, + readPolyglotFile) +import Game.Chess.SAN (toSAN, varToSAN) +import Game.Chess.Tree (plyForest) +import qualified Graphics.Vty as V +import Prelude hiding (last) -import Brick.Main ( App(..), defaultMain, continue, halt ) -import qualified Brick.Focus as F -import qualified Brick.Widgets.List as L -import Brick.AttrMap (AttrName, attrMap) -import Brick.Util (on) -import Brick.Types ( EventM, Next, Widget, Location(Location), BrickEvent( VtyEvent ) ) -import Brick.Widgets.Core ( showCursor, withAttr, hLimit, vLimit, hBox, vBox, str, strWrap - , (<+>), (<=>) - ) -import Brick.Widgets.Center ( hCenter ) -import Brick.Widgets.Border ( border ) -import System.FilePath -import System.Environment ( getArgs ) +import Brick.AttrMap (AttrName, attrMap) +import qualified Brick.Focus as F +import Brick.Main (App (..), continue, defaultMain, halt) +import Brick.Types (BrickEvent (VtyEvent), EventM, + Location (Location), Next, Widget) +import Brick.Util (on) +import Brick.Widgets.Border (border, borderWithLabel) +import Brick.Widgets.Center (hCenter) +import Brick.Widgets.Core (hBox, hLimit, showCursor, str, strWrap, + txt, txtWrap, vBox, vLimit, withAttr, + (<+>), (<=>)) +import qualified Brick.Widgets.List as L +import System.Environment (getArgs) +import System.FilePath data Name = List | Board | BoardStyle deriving (Show, Ord, Eq) -type Style a = Position -> Sq -> Widget a +type Style a = Position -> Square -> Widget a data St = St { _initialPosition :: Position - , _treePos :: TreePos Full (NonEmpty Ply) - , _boardStyle :: L.List Name (String, Style Name) - , _focusRing :: F.FocusRing Name + , _treePos :: TreePos Full (NonEmpty Ply) + , _boardStyle :: L.List Name (String, Style Name) + , _focusRing :: F.FocusRing Name } makeLenses ''St @@ -56,7 +58,7 @@ position st = foldl' doPly (st^.initialPosition) (st^.treePos & label) previousPosition st = foldl' doPly (st^.initialPosition) (st^.treePos & label & NonEmpty.init) -targetSquare :: St -> Int +targetSquare :: St -> Square targetSquare = plyTarget . NonEmpty.last . label . (^. treePos) elemList :: Eq a => n -> a -> [a] -> L.List n a @@ -71,7 +73,7 @@ selectedAttr :: AttrName selectedAttr = "selected" -renderPosition :: Position -> Color -> Maybe Int -> Style Name -> Widget Name +renderPosition :: Position -> Color -> Maybe Square -> Style Name -> Widget Name renderPosition pos persp tgt sty = ranks <+> border board <=> files where rev :: [a] -> [a] rev = if persp == Black then reverse else id @@ -79,8 +81,8 @@ files = str $ rev " a b c d e f g h " board = hLimit 17 . vLimit 8 . vBox $ map (hBox . spacer . map pc) squares squares = reverse $ chunksOf 8 $ rev [A1 .. H8] - c sq | Just t <- tgt, t == toIndex sq = showCursor Board $ Location (0,0) - | otherwise = id + c sq | Just t <- tgt, t == sq = showCursor Board $ Location (0,0) + | otherwise = id pc sq = c sq $ sty pos sq spacer = (str " " :) . (<> [str " "]) . intersperse (str " ") @@ -113,8 +115,8 @@ putCursorIf False _ _ = id withAttrIf :: Bool -> AttrName -> Widget n -> Widget n -withAttrIf True attr = withAttr attr -withAttrIf False _ = id +withAttrIf True attr = withAttr attr +withAttrIf False _ = id type Command = St -> EventM Name (Next St) @@ -171,9 +173,10 @@ appStartEvent = pure appDraw st = [ui] where ui = hBox [ hLimit 9 list - , hLimit 23 $ hCenter board + , hLimit 23 $ hCenter board <=> str " " <=> eco , hCenter . hLimit 40 $ str " " <=> var ] + <=> str " " <=> (str "FEN: " <+> fen) <=> str " " <=> hBox [str "Board style (+/- to change): ", style] @@ -181,6 +184,11 @@ , hCenter $ str " " , str "ESC (q) = Quit" ] + eco = maybe (str " ") drawECO (ECO.lookup (position st) defaultECO) + drawECO co = borderWithLabel (str "ECO " <+> txt (coCode co)) $ + case coVariation co of + Nothing -> txtWrap (coName co) + Just variation -> txtWrap (coName co) <=> txtWrap variation style = vLimit 1 $ L.renderList drawStyle True (st^.boardStyle) drawStyle foc (n, _) = putCursorIf foc BoardStyle (0,0) $ str n selectedStyle = maybe english (snd . snd) $ @@ -188,7 +196,7 @@ list = L.renderList (drawPly (previousPosition st)) True (plyList st) drawPly p foc = putCursorIf foc List (0,0) . withAttrIf foc selectedAttr - . str . toSAN p + . str . toSAN p board = renderPosition (position st) (color (previousPosition st)) (Just . targetSquare $ st) selectedStyle var = strWrap . varToSAN (st^.initialPosition) $ st^.treePos & label & toList fen = str . toFEN $ position st @@ -212,6 +220,9 @@ pos = startpos fr = F.focusRing [List, Board, BoardStyle] sl = L.list BoardStyle (Vec.fromList styles) 1 + +pathTree :: Tree a -> Tree (NonEmpty a) +pathTree = foldTree $ \a -> Node (pure a) . (fmap . fmap) (cons a) main :: IO () main = do diff --git a/book/eco.pgn b/book/eco.pgn new file mode 100644 --- /dev/null +++ b/book/eco.pgn @@ -0,0 +1,12143 @@ +{ +A PGN file of ECO classifications distributed with the PGN extraction +program, pgn-extract. I believe that the original file from which I +generated this was put together by Ewart Shaw, Franz Hemmer and others, +to whom appropriate thanks and acknowledgement is due. Permission has +been granted for its inclusion with the pgn-extract program, which is +available from: +https://www.cs.kent.ac.uk/~djb/pgn-extract/ + +David J. Barnes (d.j.barnes@kent.ac.uk) +} + +[ECO "A00"] +[Opening "Polish (Sokolsky) opening"] + +1. b4 * + +[ECO "A00"] +[Opening "Polish"] +[Variation "Tuebingen variation"] + +1. b4 Nh6 * + +[ECO "A00"] +[Opening "Polish"] +[Variation "Outflank variation"] + +1. b4 c6 * + +[ECO "A00"] +[Opening "Benko's opening"] + +1. g3 * + +[ECO "A00"] +[Opening "Lasker simul special"] + +1. g3 h5 * + +[ECO "A00"] +[Opening "Benko's opening"] +[Variation "reversed Alekhine"] + +1. g3 e5 2. Nf3 * + +[ECO "A00"] +[Opening "Grob's attack"] + +1. g4 * + +[ECO "A00"] +[Opening "Grob"] +[Variation "spike attack"] + +1. g4 d5 2. Bg2 c6 3. g5 * + +[ECO "A00"] +[Opening "Grob"] +[Variation "Fritz gambit"] + +1. g4 d5 2. Bg2 Bxg4 3. c4 * + +[ECO "A00"] +[Opening "Grob"] +[Variation "Romford counter-gambit"] + +1. g4 d5 2. Bg2 Bxg4 3. c4 d4 * + +[ECO "A00"] +[Opening "Clemenz (Mead's, Basman's or de Klerk's) opening"] + +1. h3 * + +[ECO "A00"] +[Opening "Global opening"] + +1. h3 e5 2. a3 * + +[ECO "A00"] +[Opening "Amar (Paris) opening"] + +1. Nh3 * + +[ECO "A00"] +[Opening "Amar gambit"] + +1. Nh3 d5 2. g3 e5 3. f4 Bxh3 4. Bxh3 exf4 * + +[ECO "A00"] +[Opening "Dunst (Sleipner, Heinrichsen) opening"] + +1. Nc3 * + +[ECO "A00"] +[Opening "Dunst (Sleipner, Heinrichsen) opening"] + +1. Nc3 e5 * + +[ECO "A00"] +[Opening "Battambang opening"] + +1. Nc3 e5 2. a3 * + +[ECO "A00"] +[Opening "Novosibirsk opening"] + +1. Nc3 c5 2. d4 cxd4 3. Qxd4 Nc6 4. Qh4 * + +[ECO "A00"] +[Opening "Anderssen's opening"] + +1. a3 * + +[ECO "A00"] +[Opening "Ware (Meadow Hay) opening"] + +1. a4 * + +[ECO "A00"] +[Opening "Crab opening"] + +1. a4 e5 2. h4 * + +[ECO "A00"] +[Opening "Saragossa opening"] + +1. c3 * + +[ECO "A00"] +[Opening "Mieses opening"] + +1. d3 * + +[ECO "A00"] +[Opening "Mieses opening"] + +1. d3 e5 * + +[ECO "A00"] +[Opening "Valencia opening"] + +1. d3 e5 2. Nd2 * + +[ECO "A00"] +[Opening "Venezolana opening"] + +1. d3 c5 2. Nc3 Nc6 3. g3 * + +[ECO "A00"] +[Opening "Van't Kruijs opening"] + +1. e3 * + +[ECO "A00"] +[Opening "Amsterdam attack"] + +1. e3 e5 2. c4 d6 3. Nc3 Nc6 4. b3 Nf6 * + +[ECO "A00"] +[Opening "Gedult's opening"] + +1. f3 * + +[ECO "A00"] +[Opening "Hammerschlag (Fried fox/Pork chop opening)"] + +1. f3 e5 2. Kf2 * + +[ECO "A00"] +[Opening "Anti-Borg (Desprez) opening"] + +1. h4 * + +[ECO "A00"] +[Opening "Durkin's attack"] + +1. Na3 * + +[ECO "A01"] +[Opening "Nimzovich-Larsen attack"] + +1. b3 * + +[ECO "A01"] +[Opening "Nimzovich-Larsen attack"] +[Variation "modern variation"] + +1. b3 e5 * + +[ECO "A01"] +[Opening "Nimzovich-Larsen attack"] +[Variation "Indian variation"] + +1. b3 Nf6 * + +[ECO "A01"] +[Opening "Nimzovich-Larsen attack"] +[Variation "classical variation"] + +1. b3 d5 * + +[ECO "A01"] +[Opening "Nimzovich-Larsen attack"] +[Variation "English variation"] + +1. b3 c5 * + +[ECO "A01"] +[Opening "Nimzovich-Larsen attack"] +[Variation "Dutch variation"] + +1. b3 f5 * + +[ECO "A01"] +[Opening "Nimzovich-Larsen attack"] +[Variation "Polish variation"] + +1. b3 b5 * + +[ECO "A01"] +[Opening "Nimzovich-Larsen attack"] +[Variation "symmetrical variation"] + +1. b3 b6 * + +[ECO "A02"] +[Opening "Bird's opening"] + +1. f4 * + +[ECO "A02"] +[Opening "Bird"] +[Variation "From gambit"] + +1. f4 e5 * + +[ECO "A02"] +[Opening "Bird"] +[Variation "From gambit, Lasker variation"] + +1. f4 e5 2. fxe5 d6 3. exd6 Bxd6 4. Nf3 g5 * + +[ECO "A02"] +[Opening "Bird"] +[Variation "From gambit, Lipke variation"] + +1. f4 e5 2. fxe5 d6 3. exd6 Bxd6 4. Nf3 Nh6 5. d4 * + +[ECO "A02"] +[Opening "Bird's opening, Swiss gambit"] + +1. f4 f5 2. e4 fxe4 3. Nc3 Nf6 4. g4 * + +[ECO "A02"] +[Opening "Bird"] +[Variation "Hobbs gambit"] + +1. f4 g5 * + +[ECO "A03"] +[Opening "Bird's opening"] + +1. f4 d5 * + +[ECO "A03"] +[Opening "Mujannah opening"] + +1. f4 d5 2. c4 * + +[ECO "A03"] +[Opening "Bird's opening"] +[Variation "Williams gambit"] + +1. f4 d5 2. e4 * + +[ECO "A03"] +[Opening "Bird's opening"] +[Variation "Lasker variation"] + +1. f4 d5 2. Nf3 Nf6 3. e3 c5 * + +[ECO "A04"] +[Opening "Reti opening"] + +1. Nf3 * + +[ECO "A04"] +[Opening "Reti v Dutch"] + +1. Nf3 f5 * + +[ECO "A04"] +[Opening "Reti"] +[Variation "Pirc-Lisitsin gambit"] + +1. Nf3 f5 2. e4 * + +[ECO "A04"] +[Opening "Reti"] +[Variation "Lisitsin gambit deferred"] + +1. Nf3 f5 2. d3 Nf6 3. e4 * + +[ECO "A04"] +[Opening "Reti opening"] + +1. Nf3 d6 * + +[ECO "A04"] +[Opening "Reti"] +[Variation "Wade defence"] + +1. Nf3 d6 2. e4 Bg4 * + +[ECO "A04"] +[Opening "Reti"] +[Variation "Herrstroem gambit"] + +1. Nf3 g5 * + +[ECO "A05"] +[Opening "Reti opening"] + +1. Nf3 Nf6 * + +[ECO "A05"] +[Opening "Reti"] +[Variation "King's Indian attack, Spassky's variation"] + +1. Nf3 Nf6 2. g3 b5 * + +[ECO "A05"] +[Opening "Reti"] +[Variation "King's Indian attack"] + +1. Nf3 Nf6 2. g3 g6 * + +[ECO "A05"] +[Opening "Reti"] +[Variation "King's Indian attack, Reti-Smyslov variation"] + +1. Nf3 Nf6 2. g3 g6 3. b4 * + +[ECO "A06"] +[Opening "Reti opening"] + +1. Nf3 d5 * + +[ECO "A06"] +[Opening "Reti"] +[Variation "old Indian attack"] + +1. Nf3 d5 2. d3 * + +[ECO "A06"] +[Opening "Santasiere's folly"] + +1. Nf3 d5 2. b4 * + +[ECO "A06"] +[Opening "Tennison (Lemberg, Zukertort) gambit"] + +1. Nf3 d5 2. e4 * + +[ECO "A06"] +[Opening "Reti"] +[Variation "Nimzovich-Larsen attack"] + +1. Nf3 d5 2. b3 * + +[ECO "A07"] +[Opening "Reti"] +[Variation "King's Indian attack (Barcza system)"] + +1. Nf3 d5 2. g3 * + +[ECO "A07"] +[Opening "Reti"] +[Variation "King's Indian attack, Yugoslav variation"] + +1. Nf3 d5 2. g3 Nf6 3. Bg2 c6 4. O-O Bg4 * + +[ECO "A07"] +[Opening "Reti"] +[Variation "King's Indian attack, Keres variation"] + +1. Nf3 d5 2. g3 Bg4 3. Bg2 Nd7 * + +[ECO "A07"] +[Opening "Reti"] +[Variation "King's Indian attack"] + +1. Nf3 d5 2. g3 g6 * + +[ECO "A07"] +[Opening "Reti"] +[Variation "King's Indian attack, Pachman system"] + +1. Nf3 d5 2. g3 g6 3. Bg2 Bg7 4. O-O e5 5. d3 Ne7 * + +[ECO "A07"] +[Opening "Reti"] +[Variation "King's Indian attack (with ...c5)"] + +1. Nf3 d5 2. g3 c5 * + +[ECO "A08"] +[Opening "Reti"] +[Variation "King's Indian attack"] + +1. Nf3 d5 2. g3 c5 3. Bg2 * + +[ECO "A08"] +[Opening "Reti"] +[Variation "King's Indian attack, French variation"] + +1. Nf3 d5 2. g3 c5 3. Bg2 Nc6 4. O-O e6 5. d3 Nf6 6. Nbd2 Be7 7. e4 O-O 8. +Re1 * + +[ECO "A09"] +[Opening "Reti opening"] + +1. Nf3 d5 2. c4 * + +[ECO "A09"] +[Opening "Reti"] +[Variation "advance variation"] + +1. Nf3 d5 2. c4 d4 * + +[ECO "A09"] +[Opening "Reti accepted"] + +1. Nf3 d5 2. c4 dxc4 * + +[ECO "A09"] +[Opening "Reti accepted"] +[Variation "Keres variation"] + +1. Nf3 d5 2. c4 dxc4 3. e3 Be6 * + +[ECO "A10"] +[Opening "English opening"] + +1. c4 * + +[ECO "A10"] +[Opening "English opening"] + +1. c4 g6 * + +[ECO "A10"] +[Opening "English"] +[Variation "Adorjan defence"] + +1. c4 g6 2. e4 e5 * + +[ECO "A10"] +[Opening "English"] +[Variation "Jaenisch gambit"] + +1. c4 b5 * + +[ECO "A10"] +[Opening "English"] +[Variation "Anglo-Dutch defense"] + +1. c4 f5 * + +[ECO "A11"] +[Opening "English"] +[Variation "Caro-Kann defensive system"] + +1. c4 c6 * + +[ECO "A12"] +[Opening "English"] +[Variation "Caro-Kann defensive system"] + +1. c4 c6 2. Nf3 d5 3. b3 * + +[ECO "A12"] +[Opening "English"] +[Variation "Torre defensive system"] + +1. c4 c6 2. Nf3 d5 3. b3 Nf6 4. g3 Bg4 * + +[ECO "A12"] +[Opening "English"] +[Variation "London defensive system"] + +1. c4 c6 2. Nf3 d5 3. b3 Nf6 4. g3 Bf5 * + +[ECO "A12"] +[Opening "English"] +[Variation "Caro-Kann defensive system"] + +1. c4 c6 2. Nf3 d5 3. b3 Nf6 4. Bb2 * + +[ECO "A12"] +[Opening "English"] +[Variation "Bled variation"] + +1. c4 c6 2. Nf3 d5 3. b3 Nf6 4. Bb2 g6 * + +[ECO "A12"] +[Opening "English"] +[Variation "New York (London) defensive system"] + +1. c4 c6 2. Nf3 d5 3. b3 Nf6 4. Bb2 Bf5 * + +[ECO "A12"] +[Opening "English"] +[Variation "Capablanca's variation"] + +1. c4 c6 2. Nf3 d5 3. b3 Nf6 4. Bb2 Bg4 * + +[ECO "A12"] +[Opening "English"] +[Variation "Caro-Kann defensive system, Bogolyubov variation"] + +1. c4 c6 2. Nf3 d5 3. b3 Bg4 * + +[ECO "A13"] +[Opening "English opening"] + +1. c4 e6 * + +[ECO "A13"] +[Opening "English"] +[Variation "Romanishin gambit"] + +1. c4 e6 2. Nf3 Nf6 3. g3 a6 4. Bg2 b5 * + +[ECO "A13"] +[Opening "English opening"] +[Variation "Agincourt variation"] + +1. c4 e6 2. Nf3 d5 * + +[ECO "A13"] +[Opening "English"] +[Variation "Wimpey system"] + +1. c4 e6 2. Nf3 d5 3. b3 Nf6 4. Bb2 c5 5. e3 * + +[ECO "A13"] +[Opening "English opening"] +[Variation "Agincourt variation"] + +1. c4 e6 2. Nf3 d5 3. g3 * + +[ECO "A13"] +[Opening "English"] +[Variation "Kurajica defence"] + +1. c4 e6 2. Nf3 d5 3. g3 c6 * + +[ECO "A13"] +[Opening "English"] +[Variation "Neo-Catalan"] + +1. c4 e6 2. Nf3 d5 3. g3 Nf6 * + +[ECO "A13"] +[Opening "English"] +[Variation "Neo-Catalan accepted"] + +1. c4 e6 2. Nf3 d5 3. g3 Nf6 4. Bg2 dxc4 * + +[ECO "A14"] +[Opening "English"] +[Variation "Neo-Catalan declined"] + +1. c4 e6 2. Nf3 d5 3. g3 Nf6 4. Bg2 Be7 5. O-O * + +[ECO "A14"] +[Opening "English"] +[Variation "Symmetrical, Keres defence"] + +1. c4 e6 2. Nf3 d5 3. g3 Nf6 4. Bg2 Be7 5. O-O c5 6. cxd5 Nxd5 7. Nc3 Nc6 * + +[ECO "A15"] +[Opening "English, 1...Nf6 (Anglo-Indian defense)"] + +1. c4 Nf6 * + +[ECO "A15"] +[Opening "English orang-utan"] + +1. c4 Nf6 2. b4 * + +[ECO "A15"] +[Opening "English opening"] + +1. c4 Nf6 2. Nf3 * + +[ECO "A16"] +[Opening "English opening"] + +1. c4 Nf6 2. Nc3 * + +[ECO "A16"] +[Opening "English"] +[Variation "Anglo-Gruenfeld defense"] + +1. c4 Nf6 2. Nc3 d5 * + +[ECO "A16"] +[Opening "English"] +[Variation "Anglo-Gruenfeld, Smyslov defense"] + +1. c4 Nf6 2. Nc3 d5 3. cxd5 Nxd5 4. g3 g6 5. Bg2 Nxc3 * + +[ECO "A16"] +[Opening "English"] +[Variation "Anglo-Gruenfeld, Czech defense"] + +1. c4 Nf6 2. Nc3 d5 3. cxd5 Nxd5 4. g3 g6 5. Bg2 Nb6 * + +[ECO "A16"] +[Opening "English"] +[Variation "Anglo-Gruenfeld defense"] + +1. c4 Nf6 2. Nc3 d5 3. cxd5 Nxd5 4. Nf3 * + +[ECO "A16"] +[Opening "English"] +[Variation "Anglo-Gruenfeld defense, Korchnoi variation"] + +1. c4 Nf6 2. Nc3 d5 3. cxd5 Nxd5 4. Nf3 g6 5. g3 Bg7 6. Bg2 e5 * + +[ECO "A17"] +[Opening "English opening"] + +1. c4 Nf6 2. Nc3 e6 * + +[ECO "A17"] +[Opening "English"] +[Variation "Queens Indian formation"] + +1. c4 Nf6 2. Nc3 e6 3. Nf3 b6 * + +[ECO "A17"] +[Opening "English"] +[Variation "Queens Indian, Romanishin variation"] + +1. c4 Nf6 2. Nc3 e6 3. Nf3 b6 4. e4 Bb7 5. Bd3 * + +[ECO "A17"] +[Opening "English"] +[Variation "Nimzo-English opening"] + +1. c4 Nf6 2. Nc3 e6 3. Nf3 Bb4 * + +[ECO "A18"] +[Opening "English"] +[Variation "Mikenas-Carls variation"] + +1. c4 Nf6 2. Nc3 e6 3. e4 * + +[ECO "A18"] +[Opening "English"] +[Variation "Mikenas-Carls, Flohr variation"] + +1. c4 Nf6 2. Nc3 e6 3. e4 d5 4. e5 * + +[ECO "A18"] +[Opening "English"] +[Variation "Mikenas-Carls, Kevitz variation"] + +1. c4 Nf6 2. Nc3 e6 3. e4 Nc6 * + +[ECO "A19"] +[Opening "English"] +[Variation "Mikenas-Carls, Sicilian variation"] + +1. c4 Nf6 2. Nc3 e6 3. e4 c5 * + +[ECO "A20"] +[Opening "English opening"] + +1. c4 e5 * + +[ECO "A20"] +[Opening "English, Nimzovich variation"] + +1. c4 e5 2. Nf3 * + +[ECO "A20"] +[Opening "English, Nimzovich, Flohr variation"] + +1. c4 e5 2. Nf3 e4 * + +[ECO "A21"] +[Opening "English opening"] + +1. c4 e5 2. Nc3 * + +[ECO "A21"] +[Opening "English, Troeger defence"] + +1. c4 e5 2. Nc3 d6 3. g3 Be6 4. Bg2 Nc6 * + +[ECO "A21"] +[Opening "English, Keres variation"] + +1. c4 e5 2. Nc3 d6 3. g3 c6 * + +[ECO "A21"] +[Opening "English opening"] + +1. c4 e5 2. Nc3 d6 3. Nf3 * + +[ECO "A21"] +[Opening "English, Smyslov defence"] + +1. c4 e5 2. Nc3 d6 3. Nf3 Bg4 * + +[ECO "A21"] +[Opening "English, Kramnik-Shirov counterattack"] + +1. c4 e5 2. Nc3 Bb4 * + +[ECO "A22"] +[Opening "English opening"] + +1. c4 e5 2. Nc3 Nf6 * + +[ECO "A22"] +[Opening "English"] +[Variation "Bellon gambit"] + +1. c4 e5 2. Nc3 Nf6 3. Nf3 e4 4. Ng5 b5 * + +[ECO "A22"] +[Opening "English"] +[Variation "Carls' Bremen system"] + +1. c4 e5 2. Nc3 Nf6 3. g3 * + +[ECO "A22"] +[Opening "English"] +[Variation "Bremen, reverse dragon"] + +1. c4 e5 2. Nc3 Nf6 3. g3 d5 * + +[ECO "A22"] +[Opening "English"] +[Variation "Bremen, Smyslov system"] + +1. c4 e5 2. Nc3 Nf6 3. g3 Bb4 * + +[ECO "A23"] +[Opening "English"] +[Variation "Bremen system, Keres variation"] + +1. c4 e5 2. Nc3 Nf6 3. g3 c6 * + +[ECO "A24"] +[Opening "English"] +[Variation "Bremen system with ...g6"] + +1. c4 e5 2. Nc3 Nf6 3. g3 g6 * + +[ECO "A25"] +[Opening "English"] +[Variation "Sicilian reversed"] + +1. c4 e5 2. Nc3 Nc6 * + +[ECO "A25"] +[Opening "English"] +[Variation "closed system"] + +1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 * + +[ECO "A25"] +[Opening "English"] +[Variation "closed, Taimanov variation"] + +1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. e3 d6 6. Nge2 Nh6 * + +[ECO "A25"] +[Opening "English"] +[Variation "closed, Hort variation"] + +1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. e3 d6 6. Nge2 Be6 * + +[ECO "A25"] +[Opening "English"] +[Variation "closed, 5.Rb1"] + +1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Rb1 * + +[ECO "A25"] +[Opening "English"] +[Variation "closed, 5.Rb1 Taimanov variation"] + +1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Rb1 Nh6 * + +[ECO "A25"] +[Opening "English"] +[Variation "closed system (without ...d6)"] + +1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 * + +[ECO "A26"] +[Opening "English"] +[Variation "closed system"] + +1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 * + +[ECO "A26"] +[Opening "English"] +[Variation "Botvinnik system"] + +1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. e4 * + +[ECO "A27"] +[Opening "English"] +[Variation "three knights system"] + +1. c4 e5 2. Nc3 Nc6 3. Nf3 * + +[ECO "A28"] +[Opening "English"] +[Variation "four knights system"] + +1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 * + +[ECO "A28"] +[Opening "English"] +[Variation "Nenarokov variation"] + +1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. d4 exd4 5. Nxd4 Bb4 6. Bg5 h6 7. Bh4 +Bxc3+ 8. bxc3 Ne5 * + +[ECO "A28"] +[Opening "English"] +[Variation "Bradley Beach variation"] + +1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. d4 e4 * + +[ECO "A28"] +[Opening "English"] +[Variation "four knights, Nimzovich variation"] + +1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. e4 * + +[ECO "A28"] +[Opening "English"] +[Variation "four knights, Marini variation"] + +1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. a3 * + +[ECO "A28"] +[Opening "English"] +[Variation "four knights, Capablanca variation"] + +1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. d3 * + +[ECO "A28"] +[Opening "English"] +[Variation "four knights, 4.e3"] + +1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. e3 * + +[ECO "A28"] +[Opening "English"] +[Variation "four knights, Stean variation"] + +1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. e3 Bb4 5. Qc2 O-O 6. Nd5 Re8 7. Qf5 * + +[ECO "A28"] +[Opening "English"] +[Variation "four knights, Romanishin variation"] + +1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. e3 Bb4 5. Qc2 Bxc3 * + +[ECO "A29"] +[Opening "English"] +[Variation "four knights, kingside fianchetto"] + +1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. g3 * + +[ECO "A30"] +[Opening "English"] +[Variation "symmetrical variation"] + +1. c4 c5 * + +[ECO "A30"] +[Opening "English"] +[Variation "symmetrical, hedgehog system"] + +1. c4 c5 2. Nf3 Nf6 3. g3 b6 4. Bg2 Bb7 5. O-O e6 6. Nc3 Be7 * + +[ECO "A30"] +[Opening "English"] +[Variation "symmetrical, hedgehog, flexible formation"] + +1. c4 c5 2. Nf3 Nf6 3. g3 b6 4. Bg2 Bb7 5. O-O e6 6. Nc3 Be7 7. d4 cxd4 8. +Qxd4 d6 9. Rd1 a6 10. b3 Nbd7 * + +[ECO "A31"] +[Opening "English"] +[Variation "symmetrical, Benoni formation"] + +1. c4 c5 2. Nf3 Nf6 3. d4 * + +[ECO "A32"] +[Opening "English"] +[Variation "symmetrical variation"] + +1. c4 c5 2. Nf3 Nf6 3. d4 cxd4 4. Nxd4 e6 * + +[ECO "A33"] +[Opening "English"] +[Variation "symmetrical variation"] + +1. c4 c5 2. Nf3 Nf6 3. d4 cxd4 4. Nxd4 e6 5. Nc3 Nc6 * + +[ECO "A33"] +[Opening "English"] +[Variation "symmetrical, Geller variation"] + +1. c4 c5 2. Nf3 Nf6 3. d4 cxd4 4. Nxd4 e6 5. Nc3 Nc6 6. g3 Qb6 * + +[ECO "A34"] +[Opening "English"] +[Variation "symmetrical variation"] + +1. c4 c5 2. Nc3 * + +[ECO "A34"] +[Opening "English"] +[Variation "symmetrical, three knights system"] + +1. c4 c5 2. Nc3 Nf6 3. Nf3 d5 4. cxd5 Nxd5 * + +[ECO "A34"] +[Opening "English"] +[Variation "symmetrical variation"] + +1. c4 c5 2. Nc3 Nf6 3. g3 * + +[ECO "A34"] +[Opening "English"] +[Variation "symmetrical, Rubinstein system"] + +1. c4 c5 2. Nc3 Nf6 3. g3 d5 4. cxd5 Nxd5 5. Bg2 Nc7 * + +[ECO "A35"] +[Opening "English"] +[Variation "symmetrical variation"] + +1. c4 c5 2. Nc3 Nc6 * + +[ECO "A35"] +[Opening "English"] +[Variation "symmetrical, four knights system"] + +1. c4 c5 2. Nc3 Nc6 3. Nf3 Nf6 * + +[ECO "A36"] +[Opening "English"] +[Variation "symmetrical variation"] + +1. c4 c5 2. Nc3 Nc6 3. g3 * + +[ECO "A36"] +[Opening "English"] +[Variation "ultra-symmetrical variation"] + +1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 * + +[ECO "A36"] +[Opening "English"] +[Variation "symmetrical, Botvinnik system reversed"] + +1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. e3 e5 * + +[ECO "A36"] +[Opening "English"] +[Variation "symmetrical, Botvinnik system"] + +1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. e4 * + +[ECO "A37"] +[Opening "English"] +[Variation "symmetrical variation"] + +1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Nf3 * + +[ECO "A37"] +[Opening "English"] +[Variation "symmetrical, Botvinnik system reversed"] + +1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Nf3 e5 * + +[ECO "A38"] +[Opening "English"] +[Variation "symmetrical variation"] + +1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Nf3 Nf6 * + +[ECO "A38"] +[Opening "English"] +[Variation "symmetrical, main line with d3"] + +1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Nf3 Nf6 6. O-O O-O 7. d3 * + +[ECO "A38"] +[Opening "English"] +[Variation "symmetrical, main line with b3"] + +1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Nf3 Nf6 6. O-O O-O 7. b3 * + +[ECO "A39"] +[Opening "English"] +[Variation "symmetrical, main line with d4"] + +1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Nf3 Nf6 6. O-O O-O 7. d4 * + +[ECO "A40"] +[Opening "Queen's pawn"] + +1. d4 * + +[ECO "A40"] +[Opening "Queen's pawn"] +[Variation "Lundin (Kevitz-Mikenas) defence"] + +1. d4 Nc6 * + +[ECO "A40"] +[Opening "Queen's pawn"] +[Variation "Charlick (Englund) gambit"] + +1. d4 e5 * + +[ECO "A40"] +[Opening "Queen's pawn"] +[Variation "Englund gambit"] + +1. d4 e5 2. dxe5 Nc6 3. Nf3 Qe7 4. Qd5 f6 5. exf6 Nxf6 * + +[ECO "A40"] +[Opening "Queen's pawn"] +[Variation "English defence"] + +1. d4 b6 * + +[ECO "A40"] +[Opening "Polish defence"] + +1. d4 b5 * + +[ECO "A40"] +[Opening "Queen's pawn"] + +1. d4 e6 * + +[ECO "A40"] +[Opening "Queen's pawn"] +[Variation "Keres defence"] + +1. d4 e6 2. c4 b6 * + +[ECO "A40"] +[Opening "Queen's pawn"] +[Variation "Franco-Indian (Keres) defence"] + +1. d4 e6 2. c4 Bb4+ * + +[ECO "A40"] +[Opening "Modern defence"] + +1. d4 g6 * + +[ECO "A40"] +[Opening "Beefeater defence"] + +1. d4 g6 2. c4 Bg7 3. Nc3 c5 4. d5 Bxc3+ 5. bxc3 f5 * + +[ECO "A41"] +[Opening "Queen's Pawn"] + +1. d4 d6 * + +[ECO "A41"] +[Opening "Old Indian"] +[Variation "Tartakower (Wade) variation"] + +1. d4 d6 2. Nf3 Bg4 * + +[ECO "A41"] +[Opening "Old Indian defence"] + +1. d4 d6 2. c4 * + +[ECO "A41"] +[Opening "Modern defence"] + +1. d4 d6 2. c4 g6 3. Nc3 Bg7 * + +[ECO "A41"] +[Opening "Robatsch defence"] +[Variation "Rossolimo variation"] + +1. e4 g6 2. d4 Bg7 3. Nf3 d6 4. c4 Bg4 * + +[ECO "A42"] +[Opening "Modern defence"] +[Variation "Averbakh system"] + +1. d4 d6 2. c4 g6 3. Nc3 Bg7 4. e4 * + +[ECO "A42"] +[Opening "Pterodactyl defence"] + +1. d4 d6 2. c4 g6 3. Nc3 Bg7 4. e4 c5 5. Nf3 Qa5 * + +[ECO "A42"] +[Opening "Modern defence"] +[Variation "Averbakh system, Randspringer variation"] + +1. d4 d6 2. c4 g6 3. Nc3 Bg7 4. e4 f5 * + +[ECO "A42"] +[Opening "Modern defence"] +[Variation "Averbakh system, Kotov variation"] + +1. d4 d6 2. c4 g6 3. Nc3 Bg7 4. e4 Nc6 * + +[ECO "A43"] +[Opening "Old Benoni defence"] + +1. d4 c5 * + +[ECO "A43"] +[Opening "Old Benoni"] +[Variation "Franco-Benoni defence"] + +1. d4 c5 2. d5 e6 3. e4 * + +[ECO "A43"] +[Opening "Old Benoni"] +[Variation "Mujannah formation"] + +1. d4 c5 2. d5 f5 * + +[ECO "A43"] +[Opening "Old Benoni defence"] + +1. d4 c5 2. d5 Nf6 * + +[ECO "A43"] +[Opening "Woozle defence"] + +1. d4 c5 2. d5 Nf6 3. Nc3 Qa5 * + +[ECO "A43"] +[Opening "Old Benoni defence"] + +1. d4 c5 2. d5 Nf6 3. Nf3 * + +[ECO "A43"] +[Opening "Hawk (Habichd) defence"] + +1. d4 c5 2. d5 Nf6 3. Nf3 c4 * + +[ECO "A43"] +[Opening "Old Benoni defence"] + +1. d4 c5 2. d5 d6 * + +[ECO "A43"] +[Opening "Old Benoni"] +[Variation "Schmid's system"] + +1. d4 c5 2. d5 d6 3. Nc3 g6 * + +[ECO "A44"] +[Opening "Old Benoni defence"] + +1. d4 c5 2. d5 e5 * + +[ECO "A44"] +[Opening "Semi-Benoni (`blockade variation')"] + +1. d4 c5 2. d5 e5 3. e4 d6 * + +[ECO "A45"] +[Opening "Queen's pawn game"] + +1. d4 Nf6 * + +[ECO "A45"] +[Opening "Queen's pawn"] +[Variation "Bronstein gambit"] + +1. d4 Nf6 2. g4 * + +[ECO "A45"] +[Opening "Canard opening"] + +1. d4 Nf6 2. f4 * + +[ECO "A45"] +[Opening "Paleface attack"] + +1. d4 Nf6 2. f3 * + +[ECO "A45"] +[Opening "Blackmar-Diemer gambit"] + +1. d4 Nf6 2. f3 d5 3. e4 * + +[ECO "A45"] +[Opening "Gedult attack"] + +1. d4 Nf6 2. f3 d5 3. g4 * + +[ECO "A45"] +[Opening "Trompovsky attack (Ruth, Opovcensky opening)"] + +1. d4 Nf6 2. Bg5 * + +[ECO "A46"] +[Opening "Queen's pawn game"] + +1. d4 Nf6 2. Nf3 * + +[ECO "A46"] +[Opening "Queen's pawn"] +[Variation "Torre attack"] + +1. d4 Nf6 2. Nf3 e6 3. Bg5 * + +[ECO "A46"] +[Opening "Queen's pawn"] +[Variation "Torre attack, Wagner gambit"] + +1. d4 Nf6 2. Nf3 e6 3. Bg5 c5 4. e4 * + +[ECO "A46"] +[Opening "Queen's pawn"] +[Variation "Yusupov-Rubinstein system"] + +1. d4 Nf6 2. Nf3 e6 3. e3 * + +[ECO "A46"] +[Opening "Doery defence"] + +1. d4 Nf6 2. Nf3 Ne4 * + +[ECO "A47"] +[Opening "Queen's Indian defence"] + +1. d4 Nf6 2. Nf3 b6 * + +[ECO "A47"] +[Opening "Queen's Indian"] +[Variation "Marienbad system"] + +1. d4 Nf6 2. Nf3 b6 3. g3 Bb7 4. Bg2 c5 * + +[ECO "A47"] +[Opening "Queen's Indian"] +[Variation "Marienbad system, Berg variation"] + +1. d4 Nf6 2. Nf3 b6 3. g3 Bb7 4. Bg2 c5 5. c4 cxd4 6. Qxd4 * + +[ECO "A48"] +[Opening "King's Indian"] +[Variation "East Indian defence"] + +1. d4 Nf6 2. Nf3 g6 * + +[ECO "A48"] +[Opening "King's Indian"] +[Variation "Torre attack"] + +1. d4 Nf6 2. Nf3 g6 3. Bg5 * + +[ECO "A48"] +[Opening "King's Indian"] +[Variation "London system"] + +1. d4 Nf6 2. Nf3 g6 3. Bf4 * + +[ECO "A49"] +[Opening "King's Indian"] +[Variation "fianchetto without c4"] + +1. d4 Nf6 2. Nf3 g6 3. g3 * + +[ECO "A50"] +[Opening "Queen's pawn game"] + +1. d4 Nf6 2. c4 * + +[ECO "A50"] +[Opening "Kevitz-Trajkovich defence"] + +1. d4 Nf6 2. c4 Nc6 * + +[ECO "A50"] +[Opening "Queen's Indian accelerated"] + +1. d4 Nf6 2. c4 b6 * + +[ECO "A51"] +[Opening "Budapest defence declined"] + +1. d4 Nf6 2. c4 e5 * + +[ECO "A51"] +[Opening "Budapest"] +[Variation "Fajarowicz variation"] + +1. d4 Nf6 2. c4 e5 3. dxe5 Ne4 * + +[ECO "A51"] +[Opening "Budapest"] +[Variation "Fajarowicz, Steiner variation"] + +1. d4 Nf6 2. c4 e5 3. dxe5 Ne4 4. Qc2 * + +[ECO "A52"] +[Opening "Budapest defence"] + +1. d4 Nf6 2. c4 e5 3. dxe5 Ng4 * + +[ECO "A52"] +[Opening "Budapest"] +[Variation "Adler variation"] + +1. d4 Nf6 2. c4 e5 3. dxe5 Ng4 4. Nf3 * + +[ECO "A52"] +[Opening "Budapest"] +[Variation "Rubinstein variation"] + +1. d4 Nf6 2. c4 e5 3. dxe5 Ng4 4. Bf4 * + +[ECO "A52"] +[Opening "Budapest"] +[Variation "Alekhine variation"] + +1. d4 Nf6 2. c4 e5 3. dxe5 Ng4 4. e4 * + +[ECO "A52"] +[Opening "Budapest"] +[Variation "Alekhine, Abonyi variation"] + +1. d4 Nf6 2. c4 e5 3. dxe5 Ng4 4. e4 Nxe5 5. f4 Nec6 * + +[ECO "A52"] +[Opening "Budapest"] +[Variation "Alekhine variation, Balogh gambit"] + +1. d4 Nf6 2. c4 e5 3. dxe5 Ng4 4. e4 d6 * + +[ECO "A53"] +[Opening "Old Indian defence"] + +1. d4 Nf6 2. c4 d6 * + +[ECO "A53"] +[Opening "Old Indian"] +[Variation "Janowski variation"] + +1. d4 Nf6 2. c4 d6 3. Nc3 Bf5 * + +[ECO "A54"] +[Opening "Old Indian"] +[Variation "Ukrainian variation"] + +1. d4 Nf6 2. c4 d6 3. Nc3 e5 * + +[ECO "A54"] +[Opening "Old Indian"] +[Variation "Dus-Khotimirsky variation"] + +1. d4 Nf6 2. c4 d6 3. Nc3 e5 4. e3 Nbd7 5. Bd3 * + +[ECO "A54"] +[Opening "Old Indian"] +[Variation "Ukrainian variation, 4.Nf3"] + +1. d4 Nf6 2. c4 d6 3. Nc3 e5 4. Nf3 * + +[ECO "A55"] +[Opening "Old Indian"] +[Variation "main line"] + +1. d4 Nf6 2. c4 d6 3. Nc3 e5 4. Nf3 Nbd7 5. e4 * + +[ECO "A56"] +[Opening "Benoni defence"] + +1. d4 Nf6 2. c4 c5 * + +[ECO "A56"] +[Opening "Benoni defence, Hromodka system"] + +1. d4 Nf6 2. c4 c5 3. d5 d6 * + +[ECO "A56"] +[Opening "Vulture defence"] + +1. d4 Nf6 2. c4 c5 3. d5 Ne4 * + +[ECO "A56"] +[Opening "Czech Benoni defence"] + +1. d4 Nf6 2. c4 c5 3. d5 e5 * + +[ECO "A56"] +[Opening "Czech Benoni"] +[Variation "King's Indian system"] + +1. d4 Nf6 2. c4 c5 3. d5 e5 4. Nc3 d6 5. e4 g6 * + +[ECO "A57"] +[Opening "Benko gambit"] + +1. d4 Nf6 2. c4 c5 3. d5 b5 * + +[ECO "A57"] +[Opening "Benko gambit half accepted"] + +1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 * + +[ECO "A57"] +[Opening "Benko gambit"] +[Variation "Zaitsev system"] + +1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. Nc3 * + +[ECO "A57"] +[Opening "Benko gambit"] +[Variation "Nescafe Frappe attack"] + +1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. Nc3 axb5 6. e4 b4 7. Nb5 d6 8. +Bc4 * + +[ECO "A58"] +[Opening "Benko gambit accepted"] + +1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 * + +[ECO "A58"] +[Opening "Benko gambit"] +[Variation "Nd2 variation"] + +1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 Bxa6 6. Nc3 d6 7. Nf3 g6 8. +Nd2 * + +[ECO "A58"] +[Opening "Benko gambit"] +[Variation "fianchetto variation"] + +1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 Bxa6 6. Nc3 d6 7. Nf3 g6 8. +g3 * + +[ECO "A59"] +[Opening "Benko gambit"] +[Variation "7.e4"] + +1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 Bxa6 6. Nc3 d6 7. e4 * + +[ECO "A59"] +[Opening "Benko gambit"] +[Variation "Ne2 variation"] + +1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 Bxa6 6. Nc3 d6 7. e4 Bxf1 8. +Kxf1 g6 9. Nge2 * + +[ECO "A59"] +[Opening "Benko gambit"] + +1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 Bxa6 6. Nc3 d6 7. e4 Bxf1 8. +Kxf1 g6 9. g3 * + +[ECO "A59"] +[Opening "Benko gambit"] +[Variation "main line"] + +1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 Bxa6 6. Nc3 d6 7. e4 Bxf1 8. +Kxf1 g6 9. g3 Bg7 10. Kg2 O-O 11. Nf3 * + +[ECO "A60"] +[Opening "Benoni defence"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 * + +[ECO "A61"] +[Opening "Benoni defence"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. Nf3 g6 * + +[ECO "A61"] +[Opening "Benoni"] +[Variation "Uhlmann variation"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. Nf3 g6 7. Bg5 * + +[ECO "A61"] +[Opening "Benoni"] +[Variation "Nimzovich (knight's tour) variation"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. Nf3 g6 7. Nd2 * + +[ECO "A61"] +[Opening "Benoni"] +[Variation "fianchetto variation"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. Nf3 g6 7. g3 * + +[ECO "A62"] +[Opening "Benoni"] +[Variation "fianchetto variation"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. Nf3 g6 7. g3 Bg7 8. +Bg2 O-O * + +[ECO "A63"] +[Opening "Benoni"] +[Variation "fianchetto, 9...Nbd7"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. Nf3 g6 7. g3 Bg7 8. +Bg2 O-O 9. O-O Nbd7 * + +[ECO "A64"] +[Opening "Benoni"] +[Variation "fianchetto, 11...Re8"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. Nf3 g6 7. g3 Bg7 8. +Bg2 O-O 9. O-O Nbd7 10. Nd2 a6 11. a4 Re8 * + +[ECO "A65"] +[Opening "Benoni"] +[Variation "6.e4"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 * + +[ECO "A66"] +[Opening "Benoni"] +[Variation "pawn storm variation"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. f4 * + +[ECO "A66"] +[Opening "Benoni"] +[Variation "Mikenas variation"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. f4 Bg7 8. e5 +* + +[ECO "A67"] +[Opening "Benoni"] +[Variation "Taimanov variation"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. f4 Bg7 8. +Bb5+ * + +[ECO "A68"] +[Opening "Benoni"] +[Variation "four pawns attack"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. f4 Bg7 8. +Nf3 O-O * + +[ECO "A69"] +[Opening "Benoni"] +[Variation "four pawns attack, main line"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. f4 Bg7 8. +Nf3 O-O 9. Be2 Re8 * + +[ECO "A70"] +[Opening "Benoni"] +[Variation "classical with e4 and Nf3"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 * + +[ECO "A70"] +[Opening "Benoni"] +[Variation "classical without 9.O-O"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. +Be2 * + +[ECO "A71"] +[Opening "Benoni"] +[Variation "classical, 8.Bg5"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. +Bg5 * + +[ECO "A72"] +[Opening "Benoni"] +[Variation "classical without 9.O-O"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. +Be2 O-O * + +[ECO "A73"] +[Opening "Benoni"] +[Variation "classical, 9.O-O"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. +Be2 O-O 9. O-O * + +[ECO "A74"] +[Opening "Benoni"] +[Variation "classical, 9...a6, 10.a4"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. +Be2 O-O 9. O-O a6 10. a4 * + +[ECO "A75"] +[Opening "Benoni"] +[Variation "classical with ...a6 and 10...Bg4"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. +Be2 O-O 9. O-O a6 10. a4 Bg4 * + +[ECO "A76"] +[Opening "Benoni"] +[Variation "classical, 9...Re8"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. +Be2 O-O 9. O-O Re8 * + +[ECO "A77"] +[Opening "Benoni"] +[Variation "classical, 9...Re8, 10.Nd2"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. +Be2 O-O 9. O-O Re8 10. Nd2 * + +[ECO "A78"] +[Opening "Benoni"] +[Variation "classical with ...Re8 and ...Na6"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. +Be2 O-O 9. O-O Re8 10. Nd2 Na6 * + +[ECO "A79"] +[Opening "Benoni"] +[Variation "classical, 11.f3"] + +1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. +Be2 O-O 9. O-O Re8 10. Nd2 Na6 11. f3 * + +[ECO "A80"] +[Opening "Dutch"] + +1. d4 f5 * + +[ECO "A80"] +[Opening "Dutch, Spielmann gambit"] + +1. d4 f5 2. Nc3 Nf6 3. g4 * + +[ECO "A80"] +[Opening "Dutch, Manhattan (Alapin, Ulvestad) variation"] + +1. d4 f5 2. Qd3 * + +[ECO "A80"] +[Opening "Dutch, Von Pretzel gambit"] + +1. d4 f5 2. Qd3 e6 3. g4 * + +[ECO "A80"] +[Opening "Dutch, Korchnoi attack"] + +1. d4 f5 2. h3 * + +[ECO "A80"] +[Opening "Dutch, Krejcik gambit"] + +1. d4 f5 2. g4 * + +[ECO "A80"] +[Opening "Dutch, 2.Bg5 variation"] + +1. d4 f5 2. Bg5 * + +[ECO "A81"] +[Opening "Dutch defence"] + +1. d4 f5 2. g3 * + +[ECO "A81"] +[Opening "Dutch defence, Blackburne variation"] + +1. d4 f5 2. g3 Nf6 3. Bg2 e6 4. Nh3 * + +[ECO "A81"] +[Opening "Dutch defence"] + +1. d4 f5 2. g3 Nf6 3. Bg2 g6 * + +[ECO "A81"] +[Opening "Dutch"] +[Variation "Leningrad, Basman system"] + +1. d4 f5 2. g3 g6 3. Bg2 Bg7 4. Nf3 c6 5. O-O Nh6 * + +[ECO "A81"] +[Opening "Dutch"] +[Variation "Leningrad, Karlsbad variation"] + +1. d4 f5 2. g3 g6 3. Bg2 Bg7 4. Nh3 * + +[ECO "A82"] +[Opening "Dutch"] +[Variation "Staunton gambit"] + +1. d4 f5 2. e4 * + +[ECO "A82"] +[Opening "Dutch"] +[Variation "Balogh defence"] + +1. d4 f5 2. e4 d6 * + +[ECO "A82"] +[Opening "Dutch"] +[Variation "Staunton gambit"] + +1. d4 f5 2. e4 fxe4 * + +[ECO "A82"] +[Opening "Dutch"] +[Variation "Staunton gambit, Tartakower variation"] + +1. d4 f5 2. e4 fxe4 3. Nc3 Nf6 4. g4 * + +[ECO "A83"] +[Opening "Dutch"] +[Variation "Staunton gambit, Staunton's line"] + +1. d4 f5 2. e4 fxe4 3. Nc3 Nf6 4. Bg5 * + +[ECO "A83"] +[Opening "Dutch"] +[Variation "Staunton gambit, Alekhine variation"] + +1. d4 f5 2. e4 fxe4 3. Nc3 Nf6 4. Bg5 g6 5. h4 * + +[ECO "A83"] +[Opening "Dutch"] +[Variation "Staunton gambit, Lasker variation"] + +1. d4 f5 2. e4 fxe4 3. Nc3 Nf6 4. Bg5 g6 5. f3 * + +[ECO "A83"] +[Opening "Dutch"] +[Variation "Staunton gambit, Chigorin variation"] + +1. d4 f5 2. e4 fxe4 3. Nc3 Nf6 4. Bg5 c6 * + +[ECO "A83"] +[Opening "Dutch"] +[Variation "Staunton gambit, Nimzovich variation"] + +1. d4 f5 2. e4 fxe4 3. Nc3 Nf6 4. Bg5 b6 * + +[ECO "A84"] +[Opening "Dutch defence"] + +1. d4 f5 2. c4 * + +[ECO "A84"] +[Opening "Dutch defence"] +[Variation "Bladel variation"] + +1. d4 f5 2. c4 g6 3. Nc3 Nh6 * + +[ECO "A84"] +[Opening "Dutch defence"] + +1. d4 f5 2. c4 e6 * + +[ECO "A84"] +[Opening "Dutch defence, Rubinstein variation"] + +1. d4 f5 2. c4 e6 3. Nc3 * + +[ECO "A84"] +[Opening "Dutch"] +[Variation "Staunton gambit deferred"] + +1. d4 f5 2. c4 e6 3. e4 * + +[ECO "A84"] +[Opening "Dutch defence"] + +1. d4 f5 2. c4 Nf6 * + +[ECO "A85"] +[Opening "Dutch with c4 & Nc3"] + +1. d4 f5 2. c4 Nf6 3. Nc3 * + +[ECO "A86"] +[Opening "Dutch with c4 & g3"] + +1. d4 f5 2. c4 Nf6 3. g3 * + +[ECO "A86"] +[Opening "Dutch"] +[Variation "Hort-Antoshin system"] + +1. d4 f5 2. c4 Nf6 3. g3 d6 4. Bg2 c6 5. Nc3 Qc7 * + +[ECO "A86"] +[Opening "Dutch"] +[Variation "Leningrad variation"] + +1. d4 f5 2. c4 Nf6 3. g3 g6 * + +[ECO "A87"] +[Opening "Dutch"] +[Variation "Leningrad, main variation"] + +1. d4 f5 2. c4 Nf6 3. g3 g6 4. Bg2 Bg7 5. Nf3 * + +[ECO "A88"] +[Opening "Dutch"] +[Variation "Leningrad, main variation with c6"] + +1. d4 f5 2. c4 Nf6 3. g3 g6 4. Bg2 Bg7 5. Nf3 O-O 6. O-O d6 7. Nc3 c6 * + +[ECO "A89"] +[Opening "Dutch"] +[Variation "Leningrad, main variation with Nc6"] + +1. d4 f5 2. c4 Nf6 3. g3 g6 4. Bg2 Bg7 5. Nf3 O-O 6. O-O d6 7. Nc3 Nc6 * + +[ECO "A90"] +[Opening "Dutch defence"] + +1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 * + +[ECO "A90"] +[Opening "Dutch defence"] +[Variation "Dutch-Indian (Nimzo-Dutch) variation"] + +1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Bb4+ * + +[ECO "A90"] +[Opening "Dutch-Indian, Alekhine variation"] + +1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Bb4+ 5. Bd2 Be7 * + +[ECO "A91"] +[Opening "Dutch defence"] + +1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 * + +[ECO "A92"] +[Opening "Dutch defence"] + +1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O * + +[ECO "A92"] +[Opening "Dutch defence, Alekhine variation"] + +1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O Ne4 * + +[ECO "A92"] +[Opening "Dutch"] +[Variation "stonewall variation"] + +1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d5 * + +[ECO "A92"] +[Opening "Dutch"] +[Variation "stonewall with Nc3"] + +1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d5 7. Nc3 * + +[ECO "A93"] +[Opening "Dutch"] +[Variation "stonewall, Botwinnik variation"] + +1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d5 7. b3 * + +[ECO "A94"] +[Opening "Dutch"] +[Variation "stonewall with Ba3"] + +1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d5 7. b3 c6 8. Ba3 +* + +[ECO "A95"] +[Opening "Dutch"] +[Variation "stonewall with Nc3"] + +1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d5 7. Nc3 c6 * + +[ECO "A95"] +[Opening "Dutch"] +[Variation "stonewall: Chekhover variation"] + +1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d5 7. Nc3 c6 8. +Qc2 Qe8 9. Bg5 * + +[ECO "A96"] +[Opening "Dutch"] +[Variation "classical variation"] + +1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d6 * + +[ECO "A97"] +[Opening "Dutch"] +[Variation "Ilyin-Genevsky variation"] + +1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d6 7. Nc3 Qe8 * + +[ECO "A97"] +[Opening "Dutch"] +[Variation "Ilyin-Genevsky, Winter variation"] + +1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d6 7. Nc3 Qe8 8. +Re1 * + +[ECO "A98"] +[Opening "Dutch"] +[Variation "Ilyin-Genevsky variation with Qc2"] + +1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d6 7. Nc3 Qe8 8. +Qc2 * + +[ECO "A99"] +[Opening "Dutch"] +[Variation "Ilyin-Genevsky variation with b3"] + +1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d6 7. Nc3 Qe8 8. +b3 * + +[ECO "B00"] +[Opening "King's pawn opening"] + +1. e4 * + +[ECO "B00"] +[Opening "Hippopotamus defence"] + +1. e4 Nh6 2. d4 g6 3. c4 f6 * + +[ECO "B00"] +[Opening "Corn stalk defence"] + +1. e4 a5 * + +[ECO "B00"] +[Opening "Lemming defence"] + +1. e4 Na6 * + +[ECO "B00"] +[Opening "Fred"] + +1. e4 f5 * + +[ECO "B00"] +[Opening "Barnes defence"] + +1. e4 f6 * + +[ECO "B00"] +[Opening "Fried fox defence"] + +1. e4 f6 2. d4 Kf7 * + +[ECO "B00"] +[Opening "Carr's defence"] + +1. e4 h6 * + +[ECO "B00"] +[Opening "Reversed Grob (Borg/Basman defence/macho Grob)"] + +1. e4 g5 * + +[ECO "B00"] +[Opening "St. George (Baker) defence"] + +1. e4 a6 * + +[ECO "B00"] +[Opening "Owen defence"] + +1. e4 b6 * + +[ECO "B00"] +[Opening "Guatemala defence"] + +1. e4 b6 2. d4 Ba6 * + +[ECO "B00"] +[Opening "KP"] +[Variation "Nimzovich defence"] + +1. e4 Nc6 * + +[ECO "B00"] +[Opening "KP"] +[Variation "Nimzovich defence, Wheeler gambit"] + +1. e4 Nc6 2. b4 Nxb4 3. c3 Nc6 4. d4 * + +[ECO "B00"] +[Opening "KP"] +[Variation "Nimzovich defence"] + +1. e4 Nc6 2. Nf3 * + +[ECO "B00"] +[Opening "KP"] +[Variation "Colorado counter"] + +1. e4 Nc6 2. Nf3 f5 * + +[ECO "B00"] +[Opening "KP"] +[Variation "Nimzovich defence"] + +1. e4 Nc6 2. d4 * + +[ECO "B00"] +[Opening "KP"] +[Variation "Nimzovich defence, Marshall gambit"] + +1. e4 Nc6 2. d4 d5 3. exd5 Qxd5 4. Nc3 * + +[ECO "B00"] +[Opening "KP"] +[Variation "Nimzovich defence, Bogolyubov variation"] + +1. e4 Nc6 2. d4 d5 3. Nc3 * + +[ECO "B00"] +[Opening "KP"] +[Variation "Neo-Mongoloid defence"] + +1. e4 Nc6 2. d4 f6 * + +[ECO "B01"] +[Opening "Scandinavian (centre counter) defence"] + +1. e4 d5 * + +[ECO "B01"] +[Opening "Scandinavian defence, Lasker variation"] + +1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 Nf6 5. Nf3 Bg4 6. h3 * + +[ECO "B01"] +[Opening "Scandinavian defence"] + +1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 Nf6 5. Nf3 Bf5 * + +[ECO "B01"] +[Opening "Scandinavian defence, Gruenfeld variation"] + +1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 Nf6 5. Nf3 Bf5 6. Ne5 c6 7. g4 * + +[ECO "B01"] +[Opening "Scandinavian"] +[Variation "Anderssen counter-attack"] + +1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 e5 * + +[ECO "B01"] +[Opening "Scandinavian"] +[Variation "Anderssen counter-attack orthodox attack"] + +1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 e5 5. dxe5 Bb4 6. Bd2 Nc6 7. Nf3 * + +[ECO "B01"] +[Opening "Scandinavian"] +[Variation "Anderssen counter-attack, Goteborg system"] + +1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 e5 5. Nf3 * + +[ECO "B01"] +[Opening "Scandinavian"] +[Variation "Anderssen counter-attack, Collijn variation"] + +1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 e5 5. Nf3 Bg4 * + +[ECO "B01"] +[Opening "Scandinavian, Mieses-Kotrvc gambit"] + +1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. b4 * + +[ECO "B01"] +[Opening "Scandinavian"] +[Variation "Pytel-Wade variation"] + +1. e4 d5 2. exd5 Qxd5 3. Nc3 Qd6 * + +[ECO "B01"] +[Opening "Scandinavian defence"] + +1. e4 d5 2. exd5 Nf6 * + +[ECO "B01"] +[Opening "Scandinavian"] +[Variation "Icelandic gambit"] + +1. e4 d5 2. exd5 Nf6 3. c4 e6 * + +[ECO "B01"] +[Opening "Scandinavian gambit"] + +1. e4 d5 2. exd5 Nf6 3. c4 c6 * + +[ECO "B01"] +[Opening "Scandinavian defence"] + +1. e4 d5 2. exd5 Nf6 3. d4 * + +[ECO "B01"] +[Opening "Scandinavian"] +[Variation "Marshall variation"] + +1. e4 d5 2. exd5 Nf6 3. d4 Nxd5 * + +[ECO "B01"] +[Opening "Scandinavian"] +[Variation "Kiel variation"] + +1. e4 d5 2. exd5 Nf6 3. d4 Nxd5 4. c4 Nb4 * + +[ECO "B01"] +[Opening "Scandinavian"] +[Variation "Richter variation"] + +1. e4 d5 2. exd5 Nf6 3. d4 g6 * + +[ECO "B02"] +[Opening "Alekhine's defence"] + +1. e4 Nf6 * + +[ECO "B02"] +[Opening "Alekhine's defence"] +[Variation "Scandinavian variation"] + +1. e4 Nf6 2. Nc3 d5 * + +[ECO "B02"] +[Opening "Alekhine's defence"] +[Variation "Spielmann variation"] + +1. e4 Nf6 2. Nc3 d5 3. e5 Nfd7 4. e6 * + +[ECO "B02"] +[Opening "Alekhine's defence"] +[Variation "Maroczy variation"] + +1. e4 Nf6 2. d3 * + +[ECO "B02"] +[Opening "Alekhine's defence"] +[Variation "Krejcik variation"] + +1. e4 Nf6 2. Bc4 * + +[ECO "B02"] +[Opening "Alekhine's defence"] +[Variation "Mokele Mbembe (Buecker) variation"] + +1. e4 Nf6 2. e5 Ne4 * + +[ECO "B02"] +[Opening "Alekhine's defence"] +[Variation "Brooklyn defence"] + +1. e4 Nf6 2. e5 Ng8 * + +[ECO "B02"] +[Opening "Alekhine's defence"] + +1. e4 Nf6 2. e5 Nd5 * + +[ECO "B02"] +[Opening "Alekhine's defence"] +[Variation "Kmoch variation"] + +1. e4 Nf6 2. e5 Nd5 3. Bc4 Nb6 4. Bb3 c5 5. d3 * + +[ECO "B02"] +[Opening "Alekhine's defence"] +[Variation "Saemisch attack"] + +1. e4 Nf6 2. e5 Nd5 3. Nc3 * + +[ECO "B02"] +[Opening "Alekhine's defence"] +[Variation "Welling variation"] + +1. e4 Nf6 2. e5 Nd5 3. b3 * + +[ECO "B02"] +[Opening "Alekhine's defence"] + +1. e4 Nf6 2. e5 Nd5 3. c4 * + +[ECO "B02"] +[Opening "Alekhine's defence"] +[Variation "Steiner variation"] + +1. e4 Nf6 2. e5 Nd5 3. c4 Nb6 4. b3 * + +[ECO "B02"] +[Opening "Alekhine's defence"] +[Variation "two pawns' (Lasker's) attack"] + +1. e4 Nf6 2. e5 Nd5 3. c4 Nb6 4. c5 * + +[ECO "B02"] +[Opening "Alekhine's defence"] +[Variation "two pawns' attack, Mikenas variation"] + +1. e4 Nf6 2. e5 Nd5 3. c4 Nb6 4. c5 Nd5 5. Bc4 e6 6. Nc3 d6 * + +[ECO "B03"] +[Opening "Alekhine's defence"] + +1. e4 Nf6 2. e5 Nd5 3. d4 * + +[ECO "B03"] +[Opening "Alekhine's defence"] +[Variation "O'Sullivan gambit"] + +1. e4 Nf6 2. e5 Nd5 3. d4 b5 * + +[ECO "B03"] +[Opening "Alekhine's defence"] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 * + +[ECO "B03"] +[Opening "Alekhine's defence"] +[Variation "Balogh variation"] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Bc4 * + +[ECO "B03"] +[Opening "Alekhine's defence"] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 * + +[ECO "B03"] +[Opening "Alekhine's defence"] +[Variation "exchange variation"] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. exd6 * + +[ECO "B03"] +[Opening "Alekhine's defence"] +[Variation "exchange, Karpov variation"] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. exd6 cxd6 6. Nf3 g6 7. Be2 Bg7 8. +O-O O-O 9. h3 Nc6 10. Nc3 Bf5 11. Bf4 * + +[ECO "B03"] +[Opening "Alekhine's defence"] +[Variation "four pawns attack"] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. f4 * + +[ECO "B03"] +[Opening "Alekhine's defence"] +[Variation "four pawns attack, Korchnoi variation"] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. f4 dxe5 6. fxe5 Bf5 7. Nc3 e6 8. +Nf3 Be7 9. Be2 O-O 10. O-O f6 * + +[ECO "B03"] +[Opening "Alekhine's defence"] +[Variation "four pawns attack, 6...Nc6"] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. f4 dxe5 6. fxe5 Nc6 * + +[ECO "B03"] +[Opening "Alekhine's defence"] +[Variation "four pawns attack, Ilyin-Genevsky var."] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. f4 dxe5 6. fxe5 Nc6 7. Nf3 Bg4 8. +e6 fxe6 9. c5 * + +[ECO "B03"] +[Opening "Alekhine's defence"] +[Variation "four pawns attack, 7.Be3"] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. f4 dxe5 6. fxe5 Nc6 7. Be3 * + +[ECO "B03"] +[Opening "Alekhine's defence"] +[Variation "four pawns attack, Tartakower variation"] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. f4 dxe5 6. fxe5 Nc6 7. Be3 Bf5 8. +Nc3 e6 9. Nf3 Qd7 10. Be2 O-O-O 11. O-O Be7 * + +[ECO "B03"] +[Opening "Alekhine's defence"] +[Variation "four pawns attack, Planinc variation"] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. f4 g5 * + +[ECO "B03"] +[Opening "Alekhine's defence"] +[Variation "four pawns attack, fianchetto variation"] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. f4 g6 * + +[ECO "B03"] +[Opening "Alekhine's defence"] +[Variation "four pawns attack, Trifunovic variation"] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. f4 Bf5 * + +[ECO "B04"] +[Opening "Alekhine's defence"] +[Variation "modern variation"] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 * + +[ECO "B04"] +[Opening "Alekhine's defence"] +[Variation "modern, Larsen variation"] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 dxe5 * + +[ECO "B04"] +[Opening "Alekhine's defence"] +[Variation "modern, Schmid variation"] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Nb6 * + +[ECO "B04"] +[Opening "Alekhine's defence"] +[Variation "modern, fianchetto variation"] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 g6 * + +[ECO "B04"] +[Opening "Alekhine's defence"] +[Variation "modern, Keres variation"] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 g6 5. Bc4 Nb6 6. Bb3 Bg7 7. a4 * + +[ECO "B05"] +[Opening "Alekhine's defence"] +[Variation "modern variation, 4...Bg4"] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Bg4 * + +[ECO "B05"] +[Opening "Alekhine's defence"] +[Variation "modern, Flohr variation"] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Bg4 5. Be2 c6 * + +[ECO "B05"] +[Opening "Alekhine's defence"] +[Variation "modern, Panov variation"] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Bg4 5. h3 * + +[ECO "B05"] +[Opening "Alekhine's defence"] +[Variation "modern, Alekhine variation"] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Bg4 5. c4 * + +[ECO "B05"] +[Opening "Alekhine's defence"] +[Variation "modern, Vitolins attack"] + +1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Bg4 5. c4 Nb6 6. d5 * + +[ECO "B06"] +[Opening "Robatsch (modern) defence"] + +1. e4 g6 * + +[ECO "B06"] +[Opening "Norwegian defence"] + +1. e4 g6 2. d4 Nf6 3. e5 Nh5 4. g4 Ng7 * + +[ECO "B06"] +[Opening "Robatsch (modern) defence"] + +1. e4 g6 2. d4 Bg7 * + +[ECO "B06"] +[Opening "Robatsch defence"] +[Variation "three pawns attack"] + +1. e4 g6 2. d4 Bg7 3. f4 * + +[ECO "B06"] +[Opening "Robatsch defence"] + +1. e4 g6 2. d4 Bg7 3. Nc3 * + +[ECO "B06"] +[Opening "Robatsch defence"] +[Variation "Gurgenidze variation"] + +1. e4 g6 2. d4 Bg7 3. Nc3 c6 4. f4 d5 5. e5 h5 * + +[ECO "B06"] +[Opening "Robatsch (modern) defence"] + +1. e4 g6 2. d4 Bg7 3. Nc3 d6 * + +[ECO "B06"] +[Opening "Robatsch defence"] +[Variation "two knights variation"] + +1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. Nf3 * + +[ECO "B06"] +[Opening "Robatsch defence"] +[Variation "two knights, Suttles variation"] + +1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. Nf3 c6 * + +[ECO "B06"] +[Opening "Robatsch defence"] +[Variation "Pseudo-Austrian attack"] + +1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. f4 * + +[ECO "B07"] +[Opening "Pirc defence"] + +1. e4 d6 2. d4 Nf6 3. Nc3 * + +[ECO "B07"] +[Opening "Pirc"] +[Variation "Ufimtsev-Pytel variation"] + +1. e4 d6 2. d4 Nf6 3. Nc3 c6 * + +[ECO "B07"] +[Opening "Pirc defence"] + +1. e4 d6 2. d4 Nf6 3. Nc3 g6 * + +[ECO "B07"] +[Opening "Pirc"] +[Variation "150 attack"] + +1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Be3 c6 5. Qd2 * + +[ECO "B07"] +[Opening "Pirc"] +[Variation "Sveshnikov system"] + +1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. g3 * + +[ECO "B07"] +[Opening "Pirc"] +[Variation "Holmov system"] + +1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Bc4 * + +[ECO "B07"] +[Opening "Pirc"] +[Variation "Byrne variation"] + +1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Bg5 * + +[ECO "B07"] +[Opening "Pirc defence"] + +1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Be2 * + +[ECO "B07"] +[Opening "Pirc"] +[Variation "Chinese variation"] + +1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Be2 Bg7 5. g4 * + +[ECO "B07"] +[Opening "Pirc"] +[Variation "bayonet (Mariotti) attack"] + +1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Be2 Bg7 5. h4 * + +[ECO "B07"] +[Opening "Robatsch defence"] +[Variation "Geller's system"] + +1. e4 g6 2. d4 Bg7 3. Nf3 d6 4. c3 * + +[ECO "B08"] +[Opening "Pirc"] +[Variation "classical (two knights) system"] + +1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 * + +[ECO "B08"] +[Opening "Pirc"] +[Variation "classical (two knights) system"] + +1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 * + +[ECO "B08"] +[Opening "Pirc"] +[Variation "classical, h3 system"] + +1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. h3 * + +[ECO "B08"] +[Opening "Pirc"] +[Variation "classical system, 5.Be2"] + +1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. Be2 * + +[ECO "B09"] +[Opening "Pirc"] +[Variation "Austrian attack"] + +1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 * + +[ECO "B09"] +[Opening "Pirc"] +[Variation "Austrian attack"] + +1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 O-O * + +[ECO "B09"] +[Opening "Pirc"] +[Variation "Austrian attack, 6.e5"] + +1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 O-O 6. e5 * + +[ECO "B09"] +[Opening "Pirc"] +[Variation "Austrian attack, 6.Be3"] + +1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 O-O 6. Be3 * + +[ECO "B09"] +[Opening "Pirc"] +[Variation "Austrian attack, 6.Bd3"] + +1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 O-O 6. Bd3 * + +[ECO "B09"] +[Opening "Pirc"] +[Variation "Austrian attack, dragon formation"] + +1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 c5 * + +[ECO "B09"] +[Opening "Pirc"] +[Variation "Austrian attack, Ljubojevic variation"] + +1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Bc4 * + +[ECO "B10"] +[Opening "Caro-Kann defence"] + +1. e4 c6 * + +[ECO "B10"] +[Opening "Caro-Kann"] +[Variation "Hillbilly attack"] + +1. e4 c6 2. Bc4 * + +[ECO "B10"] +[Opening "Caro-Kann"] +[Variation "anti-Caro-Kann defence"] + +1. e4 c6 2. c4 * + +[ECO "B10"] +[Opening "Caro-Kann"] +[Variation "anti-anti-Caro-Kann defence"] + +1. e4 c6 2. c4 d5 * + +[ECO "B10"] +[Opening "Caro-Kann"] +[Variation "closed (Breyer) variation"] + +1. e4 c6 2. d3 * + +[ECO "B10"] +[Opening "Caro-Kann defence"] + +1. e4 c6 2. Nc3 * + +[ECO "B10"] +[Opening "Caro-Kann"] +[Variation "Goldman (Spielmann) variation"] + +1. e4 c6 2. Nc3 d5 3. Qf3 * + +[ECO "B10"] +[Opening "Caro-Kann"] +[Variation "two knights variation"] + +1. e4 c6 2. Nc3 d5 3. Nf3 * + +[ECO "B11"] +[Opening "Caro-Kann"] +[Variation "two knights, 3...Bg4"] + +1. e4 c6 2. Nc3 d5 3. Nf3 Bg4 * + +[ECO "B12"] +[Opening "Caro-Kann defence"] + +1. e4 c6 2. d4 * + +[ECO "B12"] +[Opening "de Bruycker defence"] + +1. e4 c6 2. d4 Na6 3. Nc3 Nc7 * + +[ECO "B12"] +[Opening "Caro-Masi defence"] + +1. e4 c6 2. d4 Nf6 * + +[ECO "B12"] +[Opening "Caro-Kann defence"] + +1. e4 c6 2. d4 d5 * + +[ECO "B12"] +[Opening "Caro-Kann"] +[Variation "Tartakower (fantasy) variation"] + +1. e4 c6 2. d4 d5 3. f3 * + +[ECO "B12"] +[Opening "Caro-Kann"] +[Variation "3.Nd2"] + +1. e4 c6 2. d4 d5 3. Nd2 * + +[ECO "B12"] +[Opening "Caro-Kann"] +[Variation "Edinburgh variation"] + +1. e4 c6 2. d4 d5 3. Nd2 Qb6 * + +[ECO "B12"] +[Opening "Caro-Kann"] +[Variation "advance variation"] + +1. e4 c6 2. d4 d5 3. e5 * + +[ECO "B12"] +[Opening "Caro-Kann"] +[Variation "advance, Short variation"] + +1. e4 c6 2. d4 d5 3. e5 Bf5 4. c3 e6 5. Be2 * + +[ECO "B13"] +[Opening "Caro-Kann"] +[Variation "exchange variation"] + +1. e4 c6 2. d4 d5 3. exd5 * + +[ECO "B13"] +[Opening "Caro-Kann"] +[Variation "exchange, Rubinstein variation"] + +1. e4 c6 2. d4 d5 3. exd5 cxd5 4. Bd3 Nc6 5. c3 Nf6 6. Bf4 * + +[ECO "B13"] +[Opening "Caro-Kann"] +[Variation "Panov-Botvinnik attack"] + +1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 * + +[ECO "B13"] +[Opening "Caro-Kann"] +[Variation "Panov-Botvinnik, Gunderam attack"] + +1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. c5 * + +[ECO "B13"] +[Opening "Caro-Kann"] +[Variation "Panov-Botvinnik attack"] + +1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 * + +[ECO "B13"] +[Opening "Caro-Kann"] +[Variation "Panov-Botvinnik, Herzog defence"] + +1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 Nc6 6. Bg5 dxc4 7. d5 Na5 * + +[ECO "B13"] +[Opening "Caro-Kann"] +[Variation "Panov-Botvinnik, normal variation"] + +1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 Nc6 6. Bg5 e6 * + +[ECO "B13"] +[Opening "Caro-Kann"] +[Variation "Panov-Botvinnik, Czerniak variation"] + +1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 Nc6 6. Bg5 Qa5 * + +[ECO "B13"] +[Opening "Caro-Kann"] +[Variation "Panov-Botvinnik, Reifir (Spielmann) variation"] + +1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 Nc6 6. Bg5 Qb6 * + +[ECO "B14"] +[Opening "Caro-Kann"] +[Variation "Panov-Botvinnik attack, 5...e6"] + +1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 e6 * + +[ECO "B14"] +[Opening "Caro-Kann"] +[Variation "Panov-Botvinnik attack, 5...g6"] + +1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 g6 * + +[ECO "B15"] +[Opening "Caro-Kann defence"] + +1. e4 c6 2. d4 d5 3. Nc3 * + +[ECO "B15"] +[Opening "Caro-Kann"] +[Variation "Gurgenidze counter-attack"] + +1. e4 c6 2. d4 d5 3. Nc3 b5 * + +[ECO "B15"] +[Opening "Caro-Kann"] +[Variation "Gurgenidze system"] + +1. e4 c6 2. d4 d5 3. Nc3 g6 * + +[ECO "B15"] +[Opening "Caro-Kann"] +[Variation "Rasa-Studier gambit"] + +1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. f3 * + +[ECO "B15"] +[Opening "Caro-Kann defence"] + +1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 * + +[ECO "B15"] +[Opening "Caro-Kann"] +[Variation "Alekhine gambit"] + +1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nf6 5. Bd3 * + +[ECO "B15"] +[Opening "Caro-Kann"] +[Variation "Tartakower (Nimzovich) variation"] + +1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nf6 5. Nxf6+ exf6 * + +[ECO "B15"] +[Opening "Caro-Kann"] +[Variation "Forgacs variation"] + +1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nf6 5. Nxf6+ exf6 6. Bc4 * + +[ECO "B16"] +[Opening "Caro-Kann"] +[Variation "Bronstein-Larsen variation"] + +1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nf6 5. Nxf6+ gxf6 * + +[ECO "B17"] +[Opening "Caro-Kann"] +[Variation "Steinitz variation"] + +1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nd7 * + +[ECO "B18"] +[Opening "Caro-Kann"] +[Variation "classical variation"] + +1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 * + +[ECO "B18"] +[Opening "Caro-Kann"] +[Variation "classical, Flohr variation"] + +1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. Nh3 * + +[ECO "B18"] +[Opening "Caro-Kann"] +[Variation "classical, Maroczy attack"] + +1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. f4 * + +[ECO "B18"] +[Opening "Caro-Kann"] +[Variation "classical, 6.h4"] + +1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. h4 * + +[ECO "B19"] +[Opening "Caro-Kann"] +[Variation "classical, 7...Nd7"] + +1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. h4 h6 7. Nf3 Nd7 * + +[ECO "B19"] +[Opening "Caro-Kann"] +[Variation "classical, Spassky variation"] + +1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. h4 h6 7. Nf3 Nd7 8. +h5 * + +[ECO "B20"] +[Opening "Sicilian defence"] + +1. e4 c5 * + +[ECO "B20"] +[Opening "Sicilian"] +[Variation "Gloria variation"] + +1. e4 c5 2. c4 d6 3. Nc3 Nc6 4. g3 h5 * + +[ECO "B20"] +[Opening "Sicilian"] +[Variation "Steinitz variation"] + +1. e4 c5 2. g3 * + +[ECO "B20"] +[Opening "Sicilian"] +[Variation "wing gambit"] + +1. e4 c5 2. b4 * + +[ECO "B20"] +[Opening "Sicilian"] +[Variation "wing gambit, Santasiere variation"] + +1. e4 c5 2. b4 cxb4 3. c4 * + +[ECO "B20"] +[Opening "Sicilian"] +[Variation "wing gambit, Marshall variation"] + +1. e4 c5 2. b4 cxb4 3. a3 * + +[ECO "B20"] +[Opening "Sicilian"] +[Variation "wing gambit, Marienbad variation"] + +1. e4 c5 2. b4 cxb4 3. a3 d5 4. exd5 Qxd5 5. Bb2 * + +[ECO "B20"] +[Opening "Sicilian"] +[Variation "wing gambit, Carlsbad variation"] + +1. e4 c5 2. b4 cxb4 3. a3 bxa3 * + +[ECO "B20"] +[Opening "Sicilian"] +[Variation "Keres variation (2.Ne2)"] + +1. e4 c5 2. Ne2 * + +[ECO "B21"] +[Opening "Sicilian"] +[Variation "Grand Prix attack"] + +1. e4 c5 2. f4 * + +[ECO "B21"] +[Opening "Sicilian"] +[Variation "Smith-Morra gambit"] + +1. e4 c5 2. d4 * + +[ECO "B21"] +[Opening "Sicilian"] +[Variation "Andreaschek gambit"] + +1. e4 c5 2. d4 cxd4 3. Nf3 e5 4. c3 * + +[ECO "B21"] +[Opening "Sicilian"] +[Variation "Smith-Morra gambit"] + +1. e4 c5 2. d4 cxd4 3. c3 * + +[ECO "B21"] +[Opening "Sicilian"] +[Variation "Smith-Morra gambit, Chicago defence"] + +1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 d6 6. Bc4 e6 7. O-O a6 8. +Qe2 b5 9. Bb3 Ra7 * + +[ECO "B22"] +[Opening "Sicilian"] +[Variation "Alapin's variation (2.c3)"] + +1. e4 c5 2. c3 * + +[ECO "B22"] +[Opening "Sicilian"] +[Variation "2.c3, Heidenfeld variation"] + +1. e4 c5 2. c3 Nf6 3. e5 Nd5 4. Nf3 Nc6 5. Na3 * + +[ECO "B23"] +[Opening "Sicilian"] +[Variation "closed"] + +1. e4 c5 2. Nc3 * + +[ECO "B23"] +[Opening "Sicilian"] +[Variation "closed, Korchnoi variation"] + +1. e4 c5 2. Nc3 e6 3. g3 d5 * + +[ECO "B23"] +[Opening "Sicilian"] +[Variation "closed, 2...Nc6"] + +1. e4 c5 2. Nc3 Nc6 * + +[ECO "B23"] +[Opening "Sicilian"] +[Variation "chameleon variation"] + +1. e4 c5 2. Nc3 Nc6 3. Nge2 * + +[ECO "B23"] +[Opening "Sicilian"] +[Variation "Grand Prix attack"] + +1. e4 c5 2. Nc3 Nc6 3. f4 * + +[ECO "B23"] +[Opening "Sicilian"] +[Variation "Grand Prix attack, Schofman variation"] + +1. e4 c5 2. Nc3 Nc6 3. f4 g6 4. Nf3 Bg7 5. Bc4 e6 6. f5 * + +[ECO "B24"] +[Opening "Sicilian"] +[Variation "closed"] + +1. e4 c5 2. Nc3 Nc6 3. g3 * + +[ECO "B24"] +[Opening "Sicilian"] +[Variation "closed, Smyslov variation"] + +1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 e6 6. Be3 Nd4 7. Nce2 * + +[ECO "B25"] +[Opening "Sicilian"] +[Variation "closed"] + +1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 * + +[ECO "B25"] +[Opening "Sicilian"] +[Variation "closed, 6.Ne2 e5 (Botvinnik)"] + +1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. Nge2 e5 * + +[ECO "B25"] +[Opening "Sicilian"] +[Variation "closed, 6.f4"] + +1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. f4 * + +[ECO "B25"] +[Opening "Sicilian"] +[Variation "closed, 6.f4 e5 (Botvinnik)"] + +1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. f4 e5 * + +[ECO "B26"] +[Opening "Sicilian"] +[Variation "closed, 6.Be3"] + +1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. Be3 * + +[ECO "B27"] +[Opening "Sicilian defence"] + +1. e4 c5 2. Nf3 * + +[ECO "B27"] +[Opening "Sicilian"] +[Variation "Stiletto (Althouse) variation"] + +1. e4 c5 2. Nf3 Qa5 * + +[ECO "B27"] +[Opening "Sicilian"] +[Variation "Quinteros variation"] + +1. e4 c5 2. Nf3 Qc7 * + +[ECO "B27"] +[Opening "Sicilian"] +[Variation "Katalimov variation"] + +1. e4 c5 2. Nf3 b6 * + +[ECO "B27"] +[Opening "Sicilian"] +[Variation "Hungarian variation"] + +1. e4 c5 2. Nf3 g6 * + +[ECO "B27"] +[Opening "Sicilian"] +[Variation "Acton extension"] + +1. e4 c5 2. Nf3 g6 3. c4 Bh6 * + +[ECO "B28"] +[Opening "Sicilian"] +[Variation "O'Kelly variation"] + +1. e4 c5 2. Nf3 a6 * + +[ECO "B29"] +[Opening "Sicilian"] +[Variation "Nimzovich-Rubinstein variation"] + +1. e4 c5 2. Nf3 Nf6 * + +[ECO "B29"] +[Opening "Sicilian"] +[Variation "Nimzovich-Rubinstein; Rubinstein counter-gambit"] + +1. e4 c5 2. Nf3 Nf6 3. e5 Nd5 4. Nc3 e6 5. Nxd5 exd5 6. d4 Nc6 * + +[ECO "B30"] +[Opening "Sicilian defence"] + +1. e4 c5 2. Nf3 Nc6 * + +[ECO "B30"] +[Opening "Sicilian"] +[Variation "Nimzovich-Rossolimo attack (without ...d6)"] + +1. e4 c5 2. Nf3 Nc6 3. Bb5 * + +[ECO "B31"] +[Opening "Sicilian"] +[Variation "Nimzovich-Rossolimo attack (with ...g6, without ...d6)"] + +1. e4 c5 2. Nf3 Nc6 3. Bb5 g6 * + +[ECO "B31"] +[Opening "Sicilian"] +[Variation "Nimzovich-Rossolimo attack, Gurgenidze variation"] + +1. e4 c5 2. Nf3 Nc6 3. Bb5 g6 4. O-O Bg7 5. Re1 e5 6. b4 * + +[ECO "B32"] +[Opening "Sicilian defence"] + +1. e4 c5 2. Nf3 Nc6 3. d4 * + +[ECO "B32"] +[Opening "Sicilian"] +[Variation "Flohr variation"] + +1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Qc7 * + +[ECO "B32"] +[Opening "Sicilian"] +[Variation "Nimzovich variation"] + +1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 d5 * + +[ECO "B32"] +[Opening "Sicilian"] +[Variation "Labourdonnais-Loewenthal variation"] + +1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e5 * + +[ECO "B32"] +[Opening "Sicilian"] +[Variation "Labourdonnais-Loewenthal (Kalashnikov) variation"] + +1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e5 5. Nb5 d6 * + +[ECO "B33"] +[Opening "Sicilian defence"] + +1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 * + +[ECO "B33"] +[Opening "Sicilian"] +[Variation "Pelikan (Lasker/Sveshnikov) variation"] + +1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 * + +[ECO "B33"] +[Opening "Sicilian"] +[Variation "Pelikan, Bird variation"] + +1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 +8. Na3 Be6 * + +[ECO "B33"] +[Opening "Sicilian"] +[Variation "Pelikan, Chelyabinsk variation"] + +1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 +8. Na3 b5 * + +[ECO "B33"] +[Opening "Sicilian"] +[Variation "Sveshnikov variation"] + +1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 +8. Na3 b5 9. Bxf6 gxf6 10. Nd5 f5 * + +[ECO "B34"] +[Opening "Sicilian"] +[Variation "accelerated fianchetto, exchange variation"] + +1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nxc6 * + +[ECO "B34"] +[Opening "Sicilian"] +[Variation "accelerated fianchetto, modern variation"] + +1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nc3 * + +[ECO "B35"] +[Opening "Sicilian"] +[Variation "accelerated fianchetto, modern variation with Bc4"] + +1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nc3 Bg7 6. Be3 Nf6 7. Bc4 * + +[ECO "B36"] +[Opening "Sicilian"] +[Variation "accelerated fianchetto, Maroczy bind"] + +1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4 * + +[ECO "B36"] +[Opening "Sicilian"] +[Variation "accelerated fianchetto, Gurgenidze variation"] + +1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4 Nf6 6. Nc3 Nxd4 7. Qxd4 d6 +* + +[ECO "B37"] +[Opening "Sicilian"] +[Variation "accelerated fianchetto, Maroczy bind, 5...Bg7"] + +1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4 Bg7 * + +[ECO "B37"] +[Opening "Sicilian"] +[Variation "accelerated fianchetto, Simagin variation"] + +1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4 Bg7 6. Nc2 d6 7. Be2 Nh6 * + +[ECO "B38"] +[Opening "Sicilian"] +[Variation "accelerated fianchetto, Maroczy bind, 6.Be3"] + +1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4 Bg7 6. Be3 * + +[ECO "B39"] +[Opening "Sicilian"] +[Variation "accelerated fianchetto, Breyer variation"] + +1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4 Bg7 6. Be3 Nf6 7. Nc3 Ng4 * + +[ECO "B40"] +[Opening "Sicilian defence"] + +1. e4 c5 2. Nf3 e6 * + +[ECO "B40"] +[Opening "Sicilian"] +[Variation "Marshall variation"] + +1. e4 c5 2. Nf3 e6 3. d4 d5 * + +[ECO "B40"] +[Opening "Sicilian defence"] + +1. e4 c5 2. Nf3 e6 3. d4 cxd4 * + +[ECO "B40"] +[Opening "Sicilian"] +[Variation "Anderssen variation"] + +1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 * + +[ECO "B40"] +[Opening "Sicilian"] +[Variation "Pin variation (Sicilian counter-attack)"] + +1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Bb4 * + +[ECO "B40"] +[Opening "Sicilian"] +[Variation "Pin, Jaffe variation"] + +1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Bb4 6. Bd3 e5 * + +[ECO "B40"] +[Opening "Sicilian"] +[Variation "Pin, Koch variation"] + +1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Bb4 6. e5 * + +[ECO "B41"] +[Opening "Sicilian"] +[Variation "Kan variation"] + +1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 * + +[ECO "B41"] +[Opening "Sicilian"] +[Variation "Kan, Maroczy bind (Reti variation)"] + +1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. c4 * + +[ECO "B41"] +[Opening "Sicilian"] +[Variation "Kan, Maroczy bind - Bronstein variation"] + +1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. c4 Nf6 6. Nc3 Bb4 7. Bd3 Nc6 8. +Bc2 * + +[ECO "B42"] +[Opening "Sicilian"] +[Variation "Kan, 5.Bd3"] + +1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 * + +[ECO "B42"] +[Opening "Sicilian"] +[Variation "Kan, Gipslis variation"] + +1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 Nf6 6. O-O d6 7. c4 g6 * + +[ECO "B42"] +[Opening "Sicilian"] +[Variation "Kan, Polugaievsky variation"] + +1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 Bc5 * + +[ECO "B42"] +[Opening "Sicilian"] +[Variation "Kan, Swiss cheese variation"] + +1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 g6 * + +[ECO "B43"] +[Opening "Sicilian"] +[Variation "Kan, 5.Nc3"] + +1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 * + +[ECO "B44"] +[Opening "Sicilian defence"] + +1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 * + +[ECO "B44"] +[Opening "Sicilian, Szen (`anti-Taimanov') variation"] + +1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nb5 * + +[ECO "B44"] +[Opening "Sicilian, Szen, hedgehog variation"] + +1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nb5 d6 6. c4 Nf6 7. N1c3 a6 8. +Na3 Be7 9. Be2 O-O 10. O-O b6 * + +[ECO "B44"] +[Opening "Sicilian, Szen variation, Dely-Kasparov gambit"] + +1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nb5 d6 6. c4 Nf6 7. N1c3 a6 8. +Na3 d5 * + +[ECO "B45"] +[Opening "Sicilian"] +[Variation "Taimanov variation"] + +1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 * + +[ECO "B45"] +[Opening "Sicilian"] +[Variation "Taimanov, American attack"] + +1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Nf6 6. Ndb5 Bb4 7. Nd6+ * + +[ECO "B46"] +[Opening "Sicilian"] +[Variation "Taimanov variation"] + +1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 a6 * + +[ECO "B47"] +[Opening "Sicilian"] +[Variation "Taimanov (Bastrikov) variation"] + +1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Qc7 * + +[ECO "B48"] +[Opening "Sicilian"] +[Variation "Taimanov variation"] + +1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Qc7 6. Be3 * + +[ECO "B49"] +[Opening "Sicilian"] +[Variation "Taimanov variation"] + +1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Qc7 6. Be3 a6 7. Be2 * + +[ECO "B50"] +[Opening "Sicilian"] + +1. e4 c5 2. Nf3 d6 * + +[ECO "B50"] +[Opening "Sicilian"] +[Variation "wing gambit deferred"] + +1. e4 c5 2. Nf3 d6 3. b4 * + +[ECO "B51"] +[Opening "Sicilian"] +[Variation "Canal-Sokolsky (Nimzovich-Rossolimo, Moscow) attack"] + +1. e4 c5 2. Nf3 d6 3. Bb5+ * + +[ECO "B52"] +[Opening "Sicilian"] +[Variation "Canal-Sokolsky attack, 3...Bd7"] + +1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 * + +[ECO "B52"] +[Opening "Sicilian"] +[Variation "Canal-Sokolsky attack, Bronstein gambit"] + +1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 4. Bxd7+ Qxd7 5. O-O Nc6 6. c3 Nf6 7. d4 * + +[ECO "B52"] +[Opening "Sicilian"] +[Variation "Canal-Sokolsky attack, Sokolsky variation"] + +1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 4. Bxd7+ Qxd7 5. c4 * + +[ECO "B53"] +[Opening "Sicilian, Chekhover variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Qxd4 * + +[ECO "B53"] +[Opening "Sicilian"] +[Variation "Chekhover, Zaitsev variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Qxd4 Nc6 5. Bb5 Qd7 * + +[ECO "B54"] +[Opening "Sicilian"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 * + +[ECO "B54"] +[Opening "Sicilian"] +[Variation "Prins (Moscow) variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. f3 * + +[ECO "B55"] +[Opening "Sicilian"] +[Variation "Prins variation, Venice attack"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. f3 e5 6. Bb5+ * + +[ECO "B56"] +[Opening "Sicilian"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 * + +[ECO "B56"] +[Opening "Sicilian"] +[Variation "Venice attack"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Bb5+ * + +[ECO "B56"] +[Opening "Sicilian"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 * + +[ECO "B57"] +[Opening "Sicilian"] +[Variation "Sozin, not Scheveningen"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bc4 * + +[ECO "B57"] +[Opening "Sicilian"] +[Variation "Magnus Smith trap"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bc4 g6 7. Nxc6 bxc6 +8. e5 * + +[ECO "B57"] +[Opening "Sicilian"] +[Variation "Sozin, Benko variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bc4 Qb6 * + +[ECO "B58"] +[Opening "Sicilian"] +[Variation "classical"] + +1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 * + +[ECO "B58"] +[Opening "Sicilian"] +[Variation "Boleslavsky variation"] + +1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 e5 * + +[ECO "B58"] +[Opening "Sicilian"] +[Variation "Boleslavsky, Louma variation"] + +1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 e5 7. Nxc6 * + +[ECO "B59"] +[Opening "Sicilian"] +[Variation "Boleslavsky variation, 7.Nb3"] + +1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 e5 7. Nb3 * + +[ECO "B60"] +[Opening "Sicilian"] +[Variation "Richter-Rauzer"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 * + +[ECO "B60"] +[Opening "Sicilian"] +[Variation "Richter-Rauzer, Bondarevsky variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 g6 * + +[ECO "B60"] +[Opening "Sicilian"] +[Variation "Richter-Rauzer, Larsen variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 Bd7 * + +[ECO "B61"] +[Opening "Sicilian"] +[Variation "Richter-Rauzer, Larsen variation, 7.Qd2"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 Bd7 7. Qd2 * + +[ECO "B62"] +[Opening "Sicilian"] +[Variation "Richter-Rauzer, 6...e6"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 * + +[ECO "B62"] +[Opening "Sicilian"] +[Variation "Richter-Rauzer, Podvebrady variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Nb3 * + +[ECO "B62"] +[Opening "Sicilian"] +[Variation "Richter-Rauzer, Margate (Alekhine) variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Bb5 * + +[ECO "B62"] +[Opening "Sicilian"] +[Variation "Richter-Rauzer, Richter attack"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Nxc6 * + +[ECO "B62"] +[Opening "Sicilian"] +[Variation "Richter-Rauzer, Keres variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd3 * + +[ECO "B63"] +[Opening "Sicilian"] +[Variation "Richter-Rauzer, Rauzer attack"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 * + +[ECO "B63"] +[Opening "Sicilian"] +[Variation "Richter-Rauzer, Rauzer attack, 7...Be7"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 Be7 * + +[ECO "B64"] +[Opening "Sicilian"] +[Variation "Richter-Rauzer, Rauzer attack, 7...Be7 defence, 9.f4"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 Be7 +8. O-O-O O-O 9. f4 * + +[ECO "B64"] +[Opening "Sicilian"] +[Variation "Richter-Rauzer, Rauzer attack, Geller variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 Be7 +8. O-O-O O-O 9. f4 e5 * + +[ECO "B65"] +[Opening "Sicilian"] +[Variation "Richter-Rauzer, Rauzer attack, 7...Be7 defence, 9...Nxd4"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 Be7 +8. O-O-O O-O 9. f4 Nxd4 * + +[ECO "B65"] +[Opening "Sicilian"] +[Variation "Richter-Rauzer, Rauzer attack, 7...Be7 defence, 9...Nxd4"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 Be7 +8. O-O-O O-O 9. f4 Nxd4 10. Qxd4 * + +[ECO "B66"] +[Opening "Sicilian"] +[Variation "Richter-Rauzer, Rauzer attack, 7...a6"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 a6 * + +[ECO "B67"] +[Opening "Sicilian"] +[Variation "Richter-Rauzer, Rauzer attack, 7...a6 defence, 8...Bd7"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 a6 8. +O-O-O Bd7 * + +[ECO "B68"] +[Opening "Sicilian"] +[Variation "Richter-Rauzer, Rauzer attack, 7...a6 defence, 9...Be7"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 a6 8. +O-O-O Bd7 9. f4 Be7 * + +[ECO "B69"] +[Opening "Sicilian"] +[Variation "Richter-Rauzer, Rauzer attack, 7...a6 defence, 11.Bxf6"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 a6 8. +O-O-O Bd7 9. f4 Be7 10. Nf3 b5 11. Bxf6 * + +[ECO "B70"] +[Opening "Sicilian"] +[Variation "dragon variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 * + +[ECO "B71"] +[Opening "Sicilian"] +[Variation "dragon, Levenfish variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. f4 * + +[ECO "B71"] +[Opening "Sicilian"] +[Variation "dragon, Levenfish; Flohr variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. f4 Nbd7 * + +[ECO "B72"] +[Opening "Sicilian"] +[Variation "dragon, 6.Be3"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 * + +[ECO "B72"] +[Opening "Sicilian"] +[Variation "dragon, classical attack"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. Be2 * + +[ECO "B72"] +[Opening "Sicilian"] +[Variation "dragon, classical, Amsterdam variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. Be2 Nc6 +8. Qd2 * + +[ECO "B72"] +[Opening "Sicilian"] +[Variation "dragon, classical, Grigoriev variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. Be2 Nc6 +8. Qd2 O-O 9. O-O-O * + +[ECO "B72"] +[Opening "Sicilian"] +[Variation "dragon, classical, Nottingham variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. Be2 Nc6 +8. Nb3 * + +[ECO "B73"] +[Opening "Sicilian"] +[Variation "dragon, classical, 8.O-O"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. Be2 Nc6 +8. O-O * + +[ECO "B73"] +[Opening "Sicilian"] +[Variation "dragon, classical, Zollner gambit"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. Be2 Nc6 +8. O-O O-O 9. f4 Qb6 10. e5 * + +[ECO "B73"] +[Opening "Sicilian"] +[Variation "dragon, classical, Richter variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. Be2 Nc6 +8. O-O O-O 9. Qd2 * + +[ECO "B74"] +[Opening "Sicilian"] +[Variation "dragon, classical, 9.Nb3"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. Be2 Nc6 +8. O-O O-O 9. Nb3 * + +[ECO "B74"] +[Opening "Sicilian"] +[Variation "dragon, classical, Stockholm attack"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. Be2 Nc6 +8. O-O O-O 9. Nb3 Be6 10. f4 Na5 11. f5 Bc4 12. Nxa5 Bxe2 13. Qxe2 Qxa5 14. +g4 * + +[ECO "B74"] +[Opening "Sicilian"] +[Variation "dragon, classical, Spielmann variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. Be2 Nc6 +8. O-O O-O 9. Nb3 Be6 10. f4 Na5 11. f5 Bc4 12. Bd3 * + +[ECO "B74"] +[Opening "Sicilian"] +[Variation "dragon, classical, Bernard defence"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. Be2 Nc6 +8. O-O O-O 9. Nb3 Be6 10. f4 Na5 11. f5 Bc4 12. Bd3 Bxd3 13. cxd3 d5 * + +[ECO "B74"] +[Opening "Sicilian"] +[Variation "dragon, classical, Reti-Tartakower variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. Be2 Nc6 +8. O-O O-O 9. Nb3 Be6 10. f4 Qc8 * + +[ECO "B74"] +[Opening "Sicilian"] +[Variation "dragon, classical, Alekhine variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. Be2 Nc6 +8. O-O O-O 9. Nb3 a5 * + +[ECO "B75"] +[Opening "Sicilian"] +[Variation "dragon, Yugoslav attack"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 * + +[ECO "B76"] +[Opening "Sicilian"] +[Variation "dragon, Yugoslav attack, 7...O-O"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O * + +[ECO "B76"] +[Opening "Sicilian"] +[Variation "dragon, Yugoslav attack, Rauser variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O 8. +Qd2 Nc6 9. O-O-O * + +[ECO "B77"] +[Opening "Sicilian"] +[Variation "dragon, Yugoslav attack, 9.Bc4"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O 8. +Qd2 Nc6 9. Bc4 * + +[ECO "B77"] +[Opening "Sicilian"] +[Variation "dragon, Yugoslav attack, Byrne variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O 8. +Qd2 Nc6 9. Bc4 a5 * + +[ECO "B77"] +[Opening "Sicilian"] +[Variation "dragon, Yugoslav attack, 9...Bd7"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O 8. +Qd2 Nc6 9. Bc4 Bd7 * + +[ECO "B78"] +[Opening "Sicilian"] +[Variation "dragon, Yugoslav attack, 10.O-O-O"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O 8. +Qd2 Nc6 9. Bc4 Bd7 10. O-O-O * + +[ECO "B79"] +[Opening "Sicilian"] +[Variation "dragon, Yugoslav attack, 12.h4"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O 8. +Qd2 Nc6 9. Bc4 Bd7 10. O-O-O Qa5 11. Bb3 Rfc8 12. h4 * + +[ECO "B80"] +[Opening "Sicilian"] +[Variation "Scheveningen variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 * + +[ECO "B80"] +[Opening "Sicilian"] +[Variation "Scheveningen, English variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Be3 a6 7. Qd2 * + +[ECO "B80"] +[Opening "Sicilian"] +[Variation "Scheveningen, Vitolins variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Bb5+ * + +[ECO "B80"] +[Opening "Sicilian"] +[Variation "Scheveningen, fianchetto variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. g3 * + +[ECO "B81"] +[Opening "Sicilian"] +[Variation "Scheveningen, Keres attack"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. g4 * + +[ECO "B82"] +[Opening "Sicilian"] +[Variation "Scheveningen, 6.f4"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. f4 * + +[ECO "B82"] +[Opening "Sicilian"] +[Variation "Scheveningen, Tal variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. f4 Nc6 7. Be3 Be7 8. +Qf3 * + +[ECO "B83"] +[Opening "Sicilian"] +[Variation "Scheveningen, 6.Be2"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Be2 * + +[ECO "B83"] +[Opening "Sicilian"] +[Variation "modern Scheveningen"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Be2 Nc6 * + +[ECO "B83"] +[Opening "Sicilian"] +[Variation "modern Scheveningen, main line"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Be2 Nc6 7. O-O Be7 +8. Be3 O-O 9. f4 * + +[ECO "B83"] +[Opening "Sicilian"] +[Variation "modern Scheveningen, main line with Nb3"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Be2 Nc6 7. O-O Be7 +8. Be3 O-O 9. f4 Bd7 10. Nb3 * + +[ECO "B84"] +[Opening "Sicilian"] +[Variation "Scheveningen (Paulsen), classical variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Be2 a6 * + +[ECO "B84"] +[Opening "Sicilian"] +[Variation "Scheveningen, classical, Nd7 system"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Be2 a6 7. O-O Nbd7 * + +[ECO "B84"] +[Opening "Sicilian"] +[Variation "Scheveningen (Paulsen), classical variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Be2 a6 7. O-O Qc7 * + +[ECO "B85"] +[Opening "Sicilian"] +[Variation "Scheveningen, classical variation with ...Qc7 and ...Nc6"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Be2 a6 7. O-O Qc7 8. +f4 Nc6 * + +[ECO "B85"] +[Opening "Sicilian"] +[Variation "Scheveningen, classical, Maroczy system"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Be2 a6 7. O-O Qc7 8. +f4 Nc6 9. Kh1 Be7 10. a4 * + +[ECO "B85"] +[Opening "Sicilian"] +[Variation "Scheveningen, classical"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Be2 a6 7. O-O Qc7 8. +f4 Nc6 9. Be3 * + +[ECO "B85"] +[Opening "Sicilian"] +[Variation "Scheveningen, classical main line"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Be2 a6 7. O-O Qc7 8. +f4 Nc6 9. Be3 Be7 10. Qe1 O-O * + +[ECO "B86"] +[Opening "Sicilian"] +[Variation "Sozin attack"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Bc4 * + +[ECO "B87"] +[Opening "Sicilian"] +[Variation "Sozin with ...a6 and ...b5"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Bc4 a6 7. Bb3 b5 * + +[ECO "B88"] +[Opening "Sicilian"] +[Variation "Sozin, Leonhardt variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Bc4 Nc6 * + +[ECO "B88"] +[Opening "Sicilian"] +[Variation "Sozin, Fischer variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Bc4 Nc6 7. Bb3 Be7 +8. Be3 O-O 9. f4 * + +[ECO "B89"] +[Opening "Sicilian"] +[Variation "Sozin, 7.Be3"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Bc4 Nc6 7. Be3 * + +[ECO "B89"] +[Opening "Sicilian"] +[Variation "Velimirovic attack"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Bc4 Nc6 7. Be3 Be7 +8. Qe2 * + +[ECO "B90"] +[Opening "Sicilian"] +[Variation "Najdorf"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 * + +[ECO "B90"] +[Opening "Sicilian"] +[Variation "Najdorf, Adams attack"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. h3 * + +[ECO "B90"] +[Opening "Sicilian"] +[Variation "Najdorf, Lipnitzky attack"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bc4 * + +[ECO "B90"] +[Opening "Sicilian"] +[Variation "Najdorf, Byrne (English) attack"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 * + +[ECO "B91"] +[Opening "Sicilian"] +[Variation "Najdorf, Zagreb (fianchetto) variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. g3 * + +[ECO "B92"] +[Opening "Sicilian"] +[Variation "Najdorf, Opovcensky variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 * + +[ECO "B93"] +[Opening "Sicilian"] +[Variation "Najdorf, 6.f4"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. f4 * + +[ECO "B94"] +[Opening "Sicilian"] +[Variation "Najdorf, 6.Bg5"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 * + +[ECO "B94"] +[Opening "Sicilian"] +[Variation "Najdorf, Ivkov variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 Nbd7 7. Bc4 Qa5 +8. Qd2 e6 9. O-O-O b5 10. Bb3 Bb7 11. Rhe1 Nc5 12. e5 * + +[ECO "B95"] +[Opening "Sicilian"] +[Variation "Najdorf, 6...e6"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 * + +[ECO "B96"] +[Opening "Sicilian"] +[Variation "Najdorf, 7.f4"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 * + +[ECO "B96"] +[Opening "Sicilian"] +[Variation "Najdorf, Polugayevsky variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 b5 * + +[ECO "B96"] +[Opening "Sicilian"] +[Variation "Najdorf, Polugayevsky, Simagin variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 b5 8. +e5 dxe5 9. fxe5 Qc7 10. Qe2 * + +[ECO "B97"] +[Opening "Sicilian"] +[Variation "Najdorf, 7...Qb6"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Qb6 * + +[ECO "B97"] +[Opening "Sicilian"] +[Variation "Najdorf, Poisoned pawn variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Qb6 8. +Qd2 Qxb2 9. Rb1 Qa3 * + +[ECO "B98"] +[Opening "Sicilian"] +[Variation "Najdorf, 7...Be7"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Be7 * + +[ECO "B98"] +[Opening "Sicilian"] +[Variation "Najdorf, Browne variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Be7 8. +Qf3 h6 9. Bh4 Qc7 * + +[ECO "B98"] +[Opening "Sicilian"] +[Variation "Najdorf, Goteborg (Argentine) variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Be7 8. +Qf3 h6 9. Bh4 g5 * + +[ECO "B98"] +[Opening "Sicilian"] +[Variation "Najdorf variation"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Be7 8. +Qf3 Qc7 * + +[ECO "B99"] +[Opening "Sicilian"] +[Variation "Najdorf, 7...Be7 main line"] + +1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Be7 8. +Qf3 Qc7 9. O-O-O Nbd7 * + +[ECO "C00"] +[Opening "French defence"] + +1. e4 e6 * + +[ECO "C00"] +[Opening "French defence, Steiner variation"] + +1. e4 e6 2. c4 * + +[ECO "C00"] +[Opening "French"] +[Variation "Reti (Spielmann) variation"] + +1. e4 e6 2. b3 * + +[ECO "C00"] +[Opening "French"] +[Variation "Steinitz attack"] + +1. e4 e6 2. e5 * + +[ECO "C00"] +[Opening "French"] +[Variation "Labourdonnais variation"] + +1. e4 e6 2. f4 * + +[ECO "C00"] +[Opening "French defence"] + +1. e4 e6 2. Nf3 * + +[ECO "C00"] +[Opening "French"] +[Variation "Wing gambit"] + +1. e4 e6 2. Nf3 d5 3. e5 c5 4. b4 * + +[ECO "C00"] +[Opening "French defence"] + +1. e4 e6 2. Nc3 * + +[ECO "C00"] +[Opening "French"] +[Variation "Pelikan variation"] + +1. e4 e6 2. Nc3 d5 3. f4 * + +[ECO "C00"] +[Opening "French"] +[Variation "Two knights variation"] + +1. e4 e6 2. Nc3 d5 3. Nf3 * + +[ECO "C00"] +[Opening "French"] +[Variation "Chigorin variation"] + +1. e4 e6 2. Qe2 * + +[ECO "C00"] +[Opening "French"] +[Variation "King's Indian attack"] + +1. e4 e6 2. d3 * + +[ECO "C00"] +[Opening "French"] +[Variation "Reversed Philidor formation"] + +1. e4 e6 2. d3 d5 3. Nd2 Nf6 4. Ngf3 Nc6 5. Be2 * + +[ECO "C00"] +[Opening "French defence"] + +1. e4 e6 2. d4 * + +[ECO "C00"] +[Opening "Lengfellner system"] + +1. e4 e6 2. d4 d6 * + +[ECO "C00"] +[Opening "St. George defence"] + +1. e4 e6 2. d4 a6 * + +[ECO "C00"] +[Opening "French defence"] + +1. e4 e6 2. d4 d5 * + +[ECO "C00"] +[Opening "French"] +[Variation "Schlechter variation"] + +1. e4 e6 2. d4 d5 3. Bd3 * + +[ECO "C00"] +[Opening "French"] +[Variation "Alapin variation"] + +1. e4 e6 2. d4 d5 3. Be3 * + +[ECO "C01"] +[Opening "French"] +[Variation "exchange variation"] + +1. e4 e6 2. d4 d5 3. exd5 * + +[ECO "C01"] +[Opening "French"] +[Variation "exchange, Svenonius variation"] + +1. e4 e6 2. d4 d5 3. exd5 exd5 4. Nc3 Nf6 5. Bg5 * + +[ECO "C01"] +[Opening "French"] +[Variation "exchange, Bogolyubov variation"] + +1. e4 e6 2. d4 d5 3. exd5 exd5 4. Nc3 Nf6 5. Bg5 Nc6 * + +[ECO "C02"] +[Opening "French"] +[Variation "advance variation"] + +1. e4 e6 2. d4 d5 3. e5 * + +[ECO "C02"] +[Opening "French"] +[Variation "advance, Steinitz variation"] + +1. e4 e6 2. d4 d5 3. e5 c5 4. dxc5 * + +[ECO "C02"] +[Opening "French"] +[Variation "advance, Nimzovich variation"] + +1. e4 e6 2. d4 d5 3. e5 c5 4. Qg4 * + +[ECO "C02"] +[Opening "French"] +[Variation "advance, Nimzovich system"] + +1. e4 e6 2. d4 d5 3. e5 c5 4. Nf3 * + +[ECO "C02"] +[Opening "French"] +[Variation "advance variation"] + +1. e4 e6 2. d4 d5 3. e5 c5 4. c3 * + +[ECO "C02"] +[Opening "French"] +[Variation "advance, Wade variation"] + +1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Qb6 5. Nf3 Bd7 * + +[ECO "C02"] +[Opening "French"] +[Variation "advance variation"] + +1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 * + +[ECO "C02"] +[Opening "French"] +[Variation "advance, Paulsen attack"] + +1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 * + +[ECO "C02"] +[Opening "French"] +[Variation "advance, Milner-Barry gambit"] + +1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Qb6 6. Bd3 * + +[ECO "C02"] +[Opening "French"] +[Variation "advance, Euwe variation"] + +1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Bd7 * + +[ECO "C03"] +[Opening "French"] +[Variation "Tarrasch"] + +1. e4 e6 2. d4 d5 3. Nd2 * + +[ECO "C03"] +[Opening "French"] +[Variation "Tarrasch, Haberditz variation"] + +1. e4 e6 2. d4 d5 3. Nd2 f5 * + +[ECO "C03"] +[Opening "French"] +[Variation "Tarrasch, Guimard variation"] + +1. e4 e6 2. d4 d5 3. Nd2 Nc6 * + +[ECO "C04"] +[Opening "French"] +[Variation "Tarrasch, Guimard main line"] + +1. e4 e6 2. d4 d5 3. Nd2 Nc6 4. Ngf3 Nf6 * + +[ECO "C05"] +[Opening "French"] +[Variation "Tarrasch, closed variation"] + +1. e4 e6 2. d4 d5 3. Nd2 Nf6 * + +[ECO "C05"] +[Opening "French"] +[Variation "Tarrasch, Botvinnik variation"] + +1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. Bd3 c5 6. c3 b6 * + +[ECO "C05"] +[Opening "French"] +[Variation "Tarrasch, closed variation"] + +1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. Bd3 c5 6. c3 Nc6 * + +[ECO "C06"] +[Opening "French"] +[Variation "Tarrasch, closed variation, main line"] + +1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. Bd3 c5 6. c3 Nc6 7. Ne2 cxd4 8. +cxd4 * + +[ECO "C06"] +[Opening "French"] +[Variation "Tarrasch, Leningrad variation"] + +1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. Bd3 c5 6. c3 Nc6 7. Ne2 cxd4 8. +cxd4 Nb6 * + +[ECO "C07"] +[Opening "French"] +[Variation "Tarrasch, open variation"] + +1. e4 e6 2. d4 d5 3. Nd2 c5 * + +[ECO "C07"] +[Opening "French"] +[Variation "Tarrasch, Eliskases variation"] + +1. e4 e6 2. d4 d5 3. Nd2 c5 4. exd5 Qxd5 5. Ngf3 cxd4 6. Bc4 Qd8 * + +[ECO "C08"] +[Opening "French"] +[Variation "Tarrasch, open, 4.ed ed"] + +1. e4 e6 2. d4 d5 3. Nd2 c5 4. exd5 exd5 * + +[ECO "C09"] +[Opening "French"] +[Variation "Tarrasch, open variation, main line"] + +1. e4 e6 2. d4 d5 3. Nd2 c5 4. exd5 exd5 5. Ngf3 Nc6 * + +[ECO "C10"] +[Opening "French"] +[Variation "Paulsen variation"] + +1. e4 e6 2. d4 d5 3. Nc3 * + +[ECO "C10"] +[Opening "French"] +[Variation "Marshall variation"] + +1. e4 e6 2. d4 d5 3. Nc3 c5 * + +[ECO "C10"] +[Opening "French"] +[Variation "Rubinstein variation"] + +1. e4 e6 2. d4 d5 3. Nc3 dxe4 * + +[ECO "C10"] +[Opening "French"] +[Variation "Fort Knox variation"] + +1. e4 e6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bd7 5. Nf3 Bc6 * + +[ECO "C10"] +[Opening "French"] +[Variation "Rubinstein variation"] + +1. e4 e6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nd7 * + +[ECO "C10"] +[Opening "French"] +[Variation "Rubinstein, Capablanca line"] + +1. e4 e6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nd7 5. Nf3 Ngf6 6. Nxf6+ Nxf6 7. Ne5 +* + +[ECO "C10"] +[Opening "French"] +[Variation "Frere (Becker) variation"] + +1. e4 e6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Qd5 * + +[ECO "C11"] +[Opening "French defence"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 * + +[ECO "C11"] +[Opening "French"] +[Variation "Swiss variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bd3 * + +[ECO "C11"] +[Opening "French"] +[Variation "Henneberger variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Be3 * + +[ECO "C11"] +[Opening "French"] +[Variation "Steinitz variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 * + +[ECO "C11"] +[Opening "French"] +[Variation "Steinitz, Bradford attack"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. dxc5 Bxc5 7. Qg4 * + +[ECO "C11"] +[Opening "French"] +[Variation "Steinitz variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. dxc5 Nc6 * + +[ECO "C11"] +[Opening "French"] +[Variation "Steinitz, Brodsky-Jones variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. dxc5 Nc6 7. a3 Bxc5 8. +Qg4 O-O 9. Nf3 f6 * + +[ECO "C11"] +[Opening "French"] +[Variation "Steinitz variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. Nf3 * + +[ECO "C11"] +[Opening "French"] +[Variation "Steinitz, Boleslavsky variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. Nf3 Nc6 7. Be3 * + +[ECO "C11"] +[Opening "French"] +[Variation "Steinitz, Gledhill attack"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. Qg4 * + +[ECO "C11"] +[Opening "French"] +[Variation "Burn variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 dxe4 * + +[ECO "C12"] +[Opening "French"] +[Variation "MacCutcheon variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 * + +[ECO "C12"] +[Opening "French"] +[Variation "MacCutcheon, Bogolyubov variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. exd5 Qxd5 6. Bxf6 gxf6 7. Qd2 +Qa5 * + +[ECO "C12"] +[Opening "French"] +[Variation "MacCutcheon, advance variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 * + +[ECO "C12"] +[Opening "French"] +[Variation "MacCutcheon, Chigorin variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. exf6 * + +[ECO "C12"] +[Opening "French"] +[Variation "MacCutcheon, Grigoriev variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. exf6 hxg5 7. fxg7 Rg8 +8. h4 gxh4 9. Qg4 * + +[ECO "C12"] +[Opening "French"] +[Variation "MacCutcheon, Bernstein variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. Bh4 * + +[ECO "C12"] +[Opening "French"] +[Variation "MacCutcheon, Janowski variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. Be3 * + +[ECO "C12"] +[Opening "French"] +[Variation "MacCutcheon, Dr. Olland (Dutch) variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. Bc1 * + +[ECO "C12"] +[Opening "French"] +[Variation "MacCutcheon, Tartakower variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. Bd2 Nfd7 * + +[ECO "C12"] +[Opening "French"] +[Variation "MacCutcheon, Lasker variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. Bd2 Bxc3 * + +[ECO "C12"] +[Opening "French"] +[Variation "MacCutcheon, Duras variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. Bd2 Bxc3 7. bxc3 Ne4 8. +Qg4 Kf8 9. Bc1 * + +[ECO "C12"] +[Opening "French"] +[Variation "MacCutcheon, Lasker variation, 8...g6"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. Bd2 Bxc3 7. bxc3 Ne4 8. +Qg4 g6 * + +[ECO "C13"] +[Opening "French"] +[Variation "classical"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 * + +[ECO "C13"] +[Opening "French"] +[Variation "classical, Anderssen variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. Bxf6 * + +[ECO "C13"] +[Opening "French"] +[Variation "classical, Anderssen-Richter variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. Bxf6 Bxf6 6. e5 Be7 7. Qg4 * + +[ECO "C13"] +[Opening "French"] +[Variation "classical, Vistaneckis (Nimzovich) variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Ng8 * + +[ECO "C13"] +[Opening "French"] +[Variation "classical, Frankfurt variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Ng8 6. Be3 b6 * + +[ECO "C13"] +[Opening "French"] +[Variation "classical, Tartakower variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Ne4 * + +[ECO "C13"] +[Opening "French"] +[Variation "Albin-Alekhine-Chatard attack"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. h4 * + +[ECO "C13"] +[Opening "French"] +[Variation "Albin-Alekhine-Chatard attack, Maroczy variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. h4 a6 * + +[ECO "C13"] +[Opening "French"] +[Variation "Albin-Alekhine-Chatard attack, Breyer variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. h4 c5 * + +[ECO "C13"] +[Opening "French"] +[Variation "Albin-Alekhine-Chatard attack, Teichmann variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. h4 f6 * + +[ECO "C13"] +[Opening "French"] +[Variation "Albin-Alekhine-Chatard attack, Spielmann variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. h4 O-O * + +[ECO "C14"] +[Opening "French"] +[Variation "classical variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. Bxe7 Qxe7 * + +[ECO "C14"] +[Opening "French"] +[Variation "classical, Tarrasch variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. Bxe7 Qxe7 7. Bd3 * + +[ECO "C14"] +[Opening "French"] +[Variation "classical, Rubinstein variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. Bxe7 Qxe7 7. Qd2 * + +[ECO "C14"] +[Opening "French"] +[Variation "classical, Alapin variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. Bxe7 Qxe7 7. Nb5 * + +[ECO "C14"] +[Opening "French"] +[Variation "classical, Pollock variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. Bxe7 Qxe7 7. Qg4 * + +[ECO "C14"] +[Opening "French"] +[Variation "classical, Steinitz variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. Bxe7 Qxe7 7. f4 * + +[ECO "C14"] +[Opening "French"] +[Variation "classical, Stahlberg variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. Bxe7 Qxe7 7. f4 O-O +8. Nf3 c5 9. Qd2 Nc6 10. O-O-O c4 * + +[ECO "C15"] +[Opening "French"] +[Variation "Winawer (Nimzovich) variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Bb4 * + +[ECO "C15"] +[Opening "French"] +[Variation "Winawer, Kondratiyev variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. Bd3 c5 5. exd5 Qxd5 6. Bd2 * + +[ECO "C15"] +[Opening "French"] +[Variation "Winawer, fingerslip variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. Bd2 * + +[ECO "C15"] +[Opening "French"] +[Variation "Winawer, Alekhine (Maroczy) gambit"] + +1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. Ne2 * + +[ECO "C15"] +[Opening "French"] +[Variation "Winawer, Alekhine gambit, Alatortsev variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. Ne2 dxe4 5. a3 Be7 6. Nxe4 Nf6 7. N2g3 O-O +8. Be2 Nc6 * + +[ECO "C15"] +[Opening "French"] +[Variation "Winawer, Alekhine gambit"] + +1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. Ne2 dxe4 5. a3 Bxc3+ * + +[ECO "C15"] +[Opening "French"] +[Variation "Winawer, Alekhine gambit, Kan variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. Ne2 dxe4 5. a3 Bxc3+ 6. Nxc3 Nc6 * + +[ECO "C16"] +[Opening "French"] +[Variation "Winawer, advance variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 * + +[ECO "C16"] +[Opening "French"] +[Variation "Winawer, Petrosian variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 Qd7 * + +[ECO "C17"] +[Opening "French"] +[Variation "Winawer, advance variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 * + +[ECO "C17"] +[Opening "French"] +[Variation "Winawer, advance, Bogolyubov variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. Bd2 * + +[ECO "C17"] +[Opening "French"] +[Variation "Winawer, advance, Russian variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. Qg4 * + +[ECO "C17"] +[Opening "French"] +[Variation "Winawer, advance, 5.a3"] + +1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 * + +[ECO "C17"] +[Opening "French"] +[Variation "Winawer, advance, Rauzer variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 cxd4 6. axb4 dxc3 7. Nf3 * + +[ECO "C18"] +[Opening "French"] +[Variation "Winawer, advance variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 * + +[ECO "C18"] +[Opening "French"] +[Variation "Winawer, classical variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Qc7 * + +[ECO "C19"] +[Opening "French"] +[Variation "Winawer, advance, 6...Ne7"] + +1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 * + +[ECO "C19"] +[Opening "French"] +[Variation "Winawer, advance, Smyslov variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. a4 * + +[ECO "C19"] +[Opening "French"] +[Variation "Winawer, advance, positional main line"] + +1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. Nf3 * + +[ECO "C19"] +[Opening "French"] +[Variation "Winawer, advance, poisoned pawn variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. Qg4 * + +[ECO "C19"] +[Opening "French"] +[Variation "Winawer, advance, poisoned pawn, Euwe-Gligoric variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. Qg4 Qc7 8. +Qxg7 Rg8 9. Qxh7 cxd4 10. Kd1 * + +[ECO "C19"] +[Opening "French"] +[Variation "Winawer, advance, poisoned pawn, Konstantinopolsky variation"] + +1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. Qg4 Qc7 8. +Qxg7 Rg8 9. Qxh7 cxd4 10. Ne2 * + +[ECO "C20"] +[Opening "King's pawn game"] + +1. e4 e5 * + +[ECO "C20"] +[Opening "KP"] +[Variation "Indian opening"] + +1. e4 e5 2. d3 * + +[ECO "C20"] +[Opening "KP"] +[Variation "Mengarini's opening"] + +1. e4 e5 2. a3 * + +[ECO "C20"] +[Opening "KP"] +[Variation "King's head opening"] + +1. e4 e5 2. f3 * + +[ECO "C20"] +[Opening "KP"] +[Variation "Patzer opening"] + +1. e4 e5 2. Qh5 * + +[ECO "C20"] +[Opening "KP"] +[Variation "Napoleon's opening"] + +1. e4 e5 2. Qf3 * + +[ECO "C20"] +[Opening "KP"] +[Variation "Lopez opening"] + +1. e4 e5 2. c3 * + +[ECO "C20"] +[Opening "Alapin's opening"] + +1. e4 e5 2. Ne2 * + +[ECO "C21"] +[Opening "Centre game"] + +1. e4 e5 2. d4 exd4 * + +[ECO "C21"] +[Opening "Centre game, Kieseritsky variation"] + +1. e4 e5 2. d4 exd4 3. Nf3 c5 4. Bc4 b5 * + +[ECO "C21"] +[Opening "Halasz gambit"] + +1. e4 e5 2. d4 exd4 3. f4 * + +[ECO "C21"] +[Opening "Danish gambit"] + +1. e4 e5 2. d4 exd4 3. c3 * + +[ECO "C21"] +[Opening "Danish gambit"] +[Variation "Collijn defence"] + +1. e4 e5 2. d4 exd4 3. c3 dxc3 4. Bc4 cxb2 5. Bxb2 Qe7 * + +[ECO "C21"] +[Opening "Danish gambit"] +[Variation "Schlechter defence"] + +1. e4 e5 2. d4 exd4 3. c3 dxc3 4. Bc4 cxb2 5. Bxb2 d5 * + +[ECO "C21"] +[Opening "Danish gambit"] +[Variation "Soerensen defence"] + +1. e4 e5 2. d4 exd4 3. c3 d5 * + +[ECO "C21"] +[Opening "Centre game"] + +1. e4 e5 2. d4 exd4 3. Qxd4 * + +[ECO "C22"] +[Opening "Centre game"] + +1. e4 e5 2. d4 exd4 3. Qxd4 Nc6 * + +[ECO "C22"] +[Opening "Centre game"] +[Variation "Paulsen attack"] + +1. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qe3 * + +[ECO "C22"] +[Opening "Centre game"] +[Variation "Charousek variation"] + +1. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qe3 Bb4+ 5. c3 Be7 * + +[ECO "C22"] +[Opening "Centre game"] +[Variation "l'Hermet variation"] + +1. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qe3 f5 * + +[ECO "C22"] +[Opening "Centre game"] +[Variation "Berger variation"] + +1. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qe3 Nf6 * + +[ECO "C22"] +[Opening "Centre game"] +[Variation "Kupreichik variation"] + +1. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qe3 Nf6 5. Nc3 Bb4 6. Bd2 O-O 7. O-O-O +Re8 8. Bc4 d6 9. Nh3 * + +[ECO "C22"] +[Opening "Centre game"] +[Variation "Hall variation"] + +1. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qc4 * + +[ECO "C23"] +[Opening "Bishop's opening"] + +1. e4 e5 2. Bc4 * + +[ECO "C23"] +[Opening "Bishop's opening"] +[Variation "Philidor counter-attack"] + +1. e4 e5 2. Bc4 c6 * + +[ECO "C23"] +[Opening "Bishop's opening"] +[Variation "Lisitsyn variation"] + +1. e4 e5 2. Bc4 c6 3. d4 d5 4. exd5 cxd5 5. Bb5+ Bd7 6. Bxd7+ Nxd7 7. dxe5 +Nxe5 8. Ne2 * + +[ECO "C23"] +[Opening "Bishop's opening"] +[Variation "Calabrese counter-gambit"] + +1. e4 e5 2. Bc4 f5 * + +[ECO "C23"] +[Opening "Bishop's opening"] +[Variation "Calabrese counter-gambit, Jaenisch variation"] + +1. e4 e5 2. Bc4 f5 3. d3 * + +[ECO "C23"] +[Opening "Bishop's opening"] +[Variation "Classical variation"] + +1. e4 e5 2. Bc4 Bc5 * + +[ECO "C23"] +[Opening "Bishop's opening"] +[Variation "Lopez gambit"] + +1. e4 e5 2. Bc4 Bc5 3. Qe2 Nc6 4. c3 Nf6 5. f4 * + +[ECO "C23"] +[Opening "Bishop's opening"] +[Variation "Philidor variation"] + +1. e4 e5 2. Bc4 Bc5 3. c3 * + +[ECO "C23"] +[Opening "Bishop's opening"] +[Variation "Pratt variation"] + +1. e4 e5 2. Bc4 Bc5 3. c3 Nf6 4. d4 exd4 5. e5 d5 6. exf6 dxc4 7. Qh5 O-O * + +[ECO "C23"] +[Opening "Bishop's opening"] +[Variation "Lewis counter-gambit"] + +1. e4 e5 2. Bc4 Bc5 3. c3 d5 * + +[ECO "C23"] +[Opening "Bishop's opening"] +[Variation "del Rio variation"] + +1. e4 e5 2. Bc4 Bc5 3. c3 Qg5 * + +[ECO "C23"] +[Opening "Bishop's opening"] +[Variation "Lewis gambit"] + +1. e4 e5 2. Bc4 Bc5 3. d4 * + +[ECO "C23"] +[Opening "Bishop's opening"] +[Variation "Wing gambit"] + +1. e4 e5 2. Bc4 Bc5 3. b4 * + +[ECO "C23"] +[Opening "Bishop's opening"] +[Variation "MacDonnell double gambit"] + +1. e4 e5 2. Bc4 Bc5 3. b4 Bxb4 4. f4 * + +[ECO "C23"] +[Opening "Bishop's opening"] +[Variation "Four pawns' gambit"] + +1. e4 e5 2. Bc4 Bc5 3. b4 Bxb4 4. f4 exf4 5. Nf3 Be7 6. d4 Bh4+ 7. g3 fxg3 +8. O-O gxh2+ 9. Kh1 * + +[ECO "C24"] +[Opening "Bishop's opening"] +[Variation "Berlin defence"] + +1. e4 e5 2. Bc4 Nf6 * + +[ECO "C24"] +[Opening "Bishop's opening"] +[Variation "Greco gambit"] + +1. e4 e5 2. Bc4 Nf6 3. f4 * + +[ECO "C24"] +[Opening "Bishop's opening"] +[Variation "Ponziani gambit"] + +1. e4 e5 2. Bc4 Nf6 3. d4 * + +[ECO "C24"] +[Opening "Bishop's opening"] +[Variation "Urusov gambit"] + +1. e4 e5 2. Bc4 Nf6 3. d4 exd4 4. Nf3 * + +[ECO "C24"] +[Opening "Bishop's opening"] +[Variation "Urusov gambit, Panov variation"] + +1. e4 e5 2. Bc4 Nf6 3. d4 exd4 4. Nf3 d5 5. exd5 Bb4+ 6. c3 Qe7+ * + +[ECO "C25"] +[Opening "Vienna game"] + +1. e4 e5 2. Nc3 * + +[ECO "C25"] +[Opening "Vienna"] +[Variation "Zhuravlev countergambit"] + +1. e4 e5 2. Nc3 Bb4 3. Qg4 Nf6 * + +[ECO "C25"] +[Opening "Vienna game, Max Lange defence"] + +1. e4 e5 2. Nc3 Nc6 * + +[ECO "C25"] +[Opening "Vienna"] +[Variation "Paulsen variation"] + +1. e4 e5 2. Nc3 Nc6 3. g3 * + +[ECO "C25"] +[Opening "Vienna"] +[Variation "Fyfe gambit"] + +1. e4 e5 2. Nc3 Nc6 3. d4 * + +[ECO "C25"] +[Opening "Vienna gambit"] + +1. e4 e5 2. Nc3 Nc6 3. f4 * + +[ECO "C25"] +[Opening "Vienna"] +[Variation "Steinitz gambit"] + +1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. d4 * + +[ECO "C25"] +[Opening "Vienna"] +[Variation "Steinitz gambit, Zukertort defence"] + +1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. d4 Qh4+ 5. Ke2 d5 * + +[ECO "C25"] +[Opening "Vienna"] +[Variation "Steinitz gambit, Fraser-Minckwitz variation"] + +1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. d4 Qh4+ 5. Ke2 b6 * + +[ECO "C25"] +[Opening "Vienna gambit"] + +1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3 * + +[ECO "C25"] +[Opening "Vienna"] +[Variation "Hamppe-Allgaier gambit"] + +1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3 g5 5. h4 g4 6. Ng5 * + +[ECO "C25"] +[Opening "Vienna"] +[Variation "Hamppe-Allgaier gambit, Alapin variation"] + +1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3 g5 5. h4 g4 6. Ng5 d6 * + +[ECO "C25"] +[Opening "Vienna"] +[Variation "Hamppe-Muzio gambit"] + +1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3 g5 5. Bc4 g4 6. O-O * + +[ECO "C25"] +[Opening "Vienna"] +[Variation "Hamppe-Muzio, Dubois variation"] + +1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3 g5 5. Bc4 g4 6. O-O gxf3 7. Qxf3 Ne5 +8. Qxf4 Qf6 * + +[ECO "C25"] +[Opening "Vienna"] +[Variation "Pierce gambit"] + +1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3 g5 5. d4 * + +[ECO "C25"] +[Opening "Vienna"] +[Variation "Pierce gambit, Rushmere attack"] + +1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3 g5 5. d4 g4 6. Bc4 gxf3 7. O-O d5 8. +exd5 Bg4 9. dxc6 * + +[ECO "C26"] +[Opening "Vienna"] +[Variation "Falkbeer variation"] + +1. e4 e5 2. Nc3 Nf6 * + +[ECO "C26"] +[Opening "Vienna"] +[Variation "Mengarini variation"] + +1. e4 e5 2. Nc3 Nf6 3. a3 * + +[ECO "C26"] +[Opening "Vienna"] +[Variation "Paulsen-Mieses variation"] + +1. e4 e5 2. Nc3 Nf6 3. g3 * + +[ECO "C26"] +[Opening "Vienna game"] + +1. e4 e5 2. Nc3 Nf6 3. Bc4 * + +[ECO "C27"] +[Opening "Vienna game"] + +1. e4 e5 2. Nc3 Nf6 3. Bc4 Nxe4 * + +[ECO "C27"] +[Opening "Vienna"] +[Variation "`Frankenstein-Dracula' variation"] + +1. e4 e5 2. Nc3 Nf6 3. Bc4 Nxe4 4. Qh5 Nd6 5. Bb3 Nc6 6. Nb5 g6 7. Qf3 f5 +8. Qd5 Qe7 9. Nxc7+ Kd8 10. Nxa8 b6 * + +[ECO "C27"] +[Opening "Vienna"] +[Variation "Adams' gambit"] + +1. e4 e5 2. Nc3 Nf6 3. Bc4 Nxe4 4. Qh5 Nd6 5. Bb3 Nc6 6. d4 * + +[ECO "C27"] +[Opening "Vienna game"] + +1. e4 e5 2. Nc3 Nf6 3. Bc4 Nxe4 4. Qh5 Nd6 5. Bb3 Be7 * + +[ECO "C27"] +[Opening "Vienna"] +[Variation "Alekhine variation"] + +1. e4 e5 2. Nc3 Nf6 3. Bc4 Nxe4 4. Qh5 Nd6 5. Bb3 Be7 6. Nf3 Nc6 7. Nxe5 * + +[ECO "C27"] +[Opening "Boden-Kieseritsky gambit"] + +1. e4 e5 2. Nc3 Nf6 3. Bc4 Nxe4 4. Nf3 * + +[ECO "C27"] +[Opening "Boden-Kieseritsky gambit"] +[Variation "Lichtenhein defence"] + +1. e4 e5 2. Nc3 Nf6 3. Bc4 Nxe4 4. Nf3 d5 * + +[ECO "C28"] +[Opening "Vienna game"] + +1. e4 e5 2. Nc3 Nf6 3. Bc4 Nc6 * + +[ECO "C29"] +[Opening "Vienna gambit"] + +1. e4 e5 2. Nc3 Nf6 3. f4 d5 * + +[ECO "C29"] +[Opening "Vienna gambit"] +[Variation "Kaufmann variation"] + +1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. Nf3 Bg4 6. Qe2 * + +[ECO "C29"] +[Opening "Vienna gambit"] +[Variation "Breyer variation"] + +1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. Nf3 Be7 * + +[ECO "C29"] +[Opening "Vienna gambit"] +[Variation "Paulsen attack"] + +1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. Qf3 * + +[ECO "C29"] +[Opening "Vienna gambit"] +[Variation "Bardeleben variation"] + +1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. Qf3 f5 * + +[ECO "C29"] +[Opening "Vienna gambit"] +[Variation "Heyde variation"] + +1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. Qf3 f5 6. d4 * + +[ECO "C29"] +[Opening "Vienna gambit"] + +1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. d3 * + +[ECO "C29"] +[Opening "Vienna gambit, Wurzburger trap"] + +1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. d3 Qh4+ 6. g3 Nxg3 7. Nf3 Qh5 +8. Nxd5 * + +[ECO "C29"] +[Opening "Vienna gambit, Steinitz variation"] + +1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. d3 * + +[ECO "C30"] +[Opening "King's gambit"] + +1. e4 e5 2. f4 * + +[ECO "C30"] +[Opening "KGD"] +[Variation "Keene's defence"] + +1. e4 e5 2. f4 Qh4+ 3. g3 Qe7 * + +[ECO "C30"] +[Opening "KGD"] +[Variation "Mafia defence"] + +1. e4 e5 2. f4 c5 * + +[ECO "C30"] +[Opening "KGD"] +[Variation "Norwalde variation"] + +1. e4 e5 2. f4 Qf6 * + +[ECO "C30"] +[Opening "KGD"] +[Variation "Norwalde variation, Buecker gambit"] + +1. e4 e5 2. f4 Qf6 3. Nf3 Qxf4 4. Nc3 Bb4 5. Bc4 * + +[ECO "C30"] +[Opening "KGD"] +[Variation "classical variation"] + +1. e4 e5 2. f4 Bc5 * + +[ECO "C30"] +[Opening "KGD"] +[Variation "classical, Svenonius variation"] + +1. e4 e5 2. f4 Bc5 3. Nf3 d6 4. Nc3 Nf6 5. Bc4 Nc6 6. d3 Bg4 7. h3 Bxf3 8. +Qxf3 exf4 * + +[ECO "C30"] +[Opening "KGD"] +[Variation "classical, Hanham variation"] + +1. e4 e5 2. f4 Bc5 3. Nf3 d6 4. Nc3 Nd7 * + +[ECO "C30"] +[Opening "KGD"] +[Variation "classical, 4.c3"] + +1. e4 e5 2. f4 Bc5 3. Nf3 d6 4. c3 * + +[ECO "C30"] +[Opening "KGD"] +[Variation "classical, Marshall attack"] + +1. e4 e5 2. f4 Bc5 3. Nf3 d6 4. c3 Bg4 5. fxe5 dxe5 6. Qa4+ * + +[ECO "C30"] +[Opening "KGD"] +[Variation "classical counter-gambit"] + +1. e4 e5 2. f4 Bc5 3. Nf3 d6 4. c3 f5 * + +[ECO "C30"] +[Opening "KGD"] +[Variation "classical, Reti variation"] + +1. e4 e5 2. f4 Bc5 3. Nf3 d6 4. c3 f5 5. fxe5 dxe5 6. d4 exd4 7. Bc4 * + +[ECO "C30"] +[Opening "KGD"] +[Variation "classical, Soldatenkov variation"] + +1. e4 e5 2. f4 Bc5 3. Nf3 d6 4. fxe5 * + +[ECO "C30"] +[Opening "KGD"] +[Variation "classical, Heath variation"] + +1. e4 e5 2. f4 Bc5 3. Nf3 d6 4. b4 * + +[ECO "C30"] +[Opening "KGD"] +[Variation "2...Nf6"] + +1. e4 e5 2. f4 Nf6 * + +[ECO "C31"] +[Opening "KGD"] +[Variation "Falkbeer counter-gambit"] + +1. e4 e5 2. f4 d5 * + +[ECO "C31"] +[Opening "KGD"] +[Variation "Falkbeer, Tartakower variation"] + +1. e4 e5 2. f4 d5 3. Nf3 * + +[ECO "C31"] +[Opening "KGD"] +[Variation "Falkbeer, Milner-Barry variation"] + +1. e4 e5 2. f4 d5 3. Nc3 * + +[ECO "C31"] +[Opening "KGD"] +[Variation "Falkbeer counter-gambit"] + +1. e4 e5 2. f4 d5 3. exd5 * + +[ECO "C31"] +[Opening "KGD"] +[Variation "Nimzovich counter-gambit"] + +1. e4 e5 2. f4 d5 3. exd5 c6 * + +[ECO "C31"] +[Opening "KGD"] +[Variation "Falkbeer, 3...e4"] + +1. e4 e5 2. f4 d5 3. exd5 e4 * + +[ECO "C31"] +[Opening "KGD"] +[Variation "Falkbeer, Rubinstein variation"] + +1. e4 e5 2. f4 d5 3. exd5 e4 4. Nc3 Nf6 5. Qe2 * + +[ECO "C31"] +[Opening "KGD"] +[Variation "Falkbeer, Nimzovich variation"] + +1. e4 e5 2. f4 d5 3. exd5 e4 4. Bb5+ * + +[ECO "C31"] +[Opening "KGD"] +[Variation "Falkbeer, 4.d3"] + +1. e4 e5 2. f4 d5 3. exd5 e4 4. d3 * + +[ECO "C31"] +[Opening "KGD"] +[Variation "Falkbeer, Morphy gambit"] + +1. e4 e5 2. f4 d5 3. exd5 e4 4. d3 Nf6 5. Nc3 Bb4 6. Bd2 e3 * + +[ECO "C32"] +[Opening "KGD"] +[Variation "Falkbeer, 5.de"] + +1. e4 e5 2. f4 d5 3. exd5 e4 4. d3 Nf6 5. dxe4 * + +[ECO "C32"] +[Opening "KGD"] +[Variation "Falkbeer, Alapin variation"] + +1. e4 e5 2. f4 d5 3. exd5 e4 4. d3 Nf6 5. dxe4 Nxe4 6. Nf3 Bc5 7. Qe2 Bf2+ +8. Kd1 Qxd5+ 9. Nfd2 * + +[ECO "C32"] +[Opening "KGD"] +[Variation "Falkbeer, main line, 7...Bf5"] + +1. e4 e5 2. f4 d5 3. exd5 e4 4. d3 Nf6 5. dxe4 Nxe4 6. Nf3 Bc5 7. Qe2 Bf5 * + +[ECO "C32"] +[Opening "KGD"] +[Variation "Falkbeer, Tarrasch variation"] + +1. e4 e5 2. f4 d5 3. exd5 e4 4. d3 Nf6 5. dxe4 Nxe4 6. Nf3 Bc5 7. Qe2 Bf5 +8. g4 O-O * + +[ECO "C32"] +[Opening "KGD"] +[Variation "Falkbeer, Charousek gambit"] + +1. e4 e5 2. f4 d5 3. exd5 e4 4. d3 Nf6 5. dxe4 Nxe4 6. Qe2 * + +[ECO "C32"] +[Opening "KGD"] +[Variation "Falkbeer, Charousek variation"] + +1. e4 e5 2. f4 d5 3. exd5 e4 4. d3 Nf6 5. dxe4 Nxe4 6. Qe2 Qxd5 7. Nd2 f5 +8. g4 * + +[ECO "C32"] +[Opening "KGD"] +[Variation "Falkbeer, Keres variation"] + +1. e4 e5 2. f4 d5 3. exd5 e4 4. d3 Nf6 5. Nd2 * + +[ECO "C32"] +[Opening "KGD"] +[Variation "Falkbeer, Reti variation"] + +1. e4 e5 2. f4 d5 3. exd5 e4 4. d3 Nf6 5. Qe2 * + +[ECO "C33"] +[Opening "King's gambit accepted"] + +1. e4 e5 2. f4 exf4 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "Tumbleweed gambit"] + +1. e4 e5 2. f4 exf4 3. Kf2 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "Orsini gambit"] + +1. e4 e5 2. f4 exf4 3. b3 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "Pawn's gambit (Stamma gambit)"] + +1. e4 e5 2. f4 exf4 3. h4 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "Schurig gambit"] + +1. e4 e5 2. f4 exf4 3. Bd3 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "Carrera (Basman) gambit"] + +1. e4 e5 2. f4 exf4 3. Qe2 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "Villemson (Steinitz) gambit"] + +1. e4 e5 2. f4 exf4 3. d4 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "Keres (Mason-Steinitz) gambit"] + +1. e4 e5 2. f4 exf4 3. Nc3 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "Breyer gambit"] + +1. e4 e5 2. f4 exf4 3. Qf3 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "Lesser bishop's (Petroff-Jaenisch-Tartakower) gambit"] + +1. e4 e5 2. f4 exf4 3. Be2 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit"] + +1. e4 e5 2. f4 exf4 3. Bc4 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, Chigorin's attack"] + +1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 d5 5. Bxd5 g5 6. g3 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, Greco variation"] + +1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 Bc5 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, classical defence"] + +1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 g5 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, Grimm attack"] + +1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 g5 5. Nc3 Bg7 6. d4 d6 7. e5 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, classical defence"] + +1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 g5 5. Nc3 Bg7 6. d4 Ne7 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, McDonnell attack"] + +1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 g5 5. Nc3 Bg7 6. d4 Ne7 7. g3 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, McDonnell attack"] + +1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 g5 5. Nc3 Bg7 6. g3 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, Fraser variation"] + +1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 g5 5. Nc3 Bg7 6. g3 fxg3 7. Qf3 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, classical defence, Cozio attack"] + +1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 g5 5. Qf3 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, Boden defence"] + +1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 Nc6 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, Bryan counter-gambit"] + +1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 b5 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, Bryan counter-gambit"] + +1. e4 e5 2. f4 exf4 3. Bc4 b5 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, Steinitz defence"] + +1. e4 e5 2. f4 exf4 3. Bc4 Ne7 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, Maurian defence"] + +1. e4 e5 2. f4 exf4 3. Bc4 Nc6 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, Ruy Lopez defence"] + +1. e4 e5 2. f4 exf4 3. Bc4 c6 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, Lopez-Gianutio counter-gambit"] + +1. e4 e5 2. f4 exf4 3. Bc4 f5 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "Lopez-Gianutio counter-gambit, Hein variation"] + +1. e4 e5 2. f4 exf4 3. Bc4 f5 4. Qe2 Qh4+ 5. Kd1 fxe4 6. Nc3 Kd8 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, Bledow variation"] + +1. e4 e5 2. f4 exf4 3. Bc4 d5 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, Gifford variation"] + +1. e4 e5 2. f4 exf4 3. Bc4 d5 4. Bxd5 Qh4+ 5. Kf1 g5 6. g3 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, Boren-Svenonius variation"] + +1. e4 e5 2. f4 exf4 3. Bc4 d5 4. Bxd5 Qh4+ 5. Kf1 Bd6 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, Anderssen variation"] + +1. e4 e5 2. f4 exf4 3. Bc4 d5 4. Bxd5 c6 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, Morphy variation"] + +1. e4 e5 2. f4 exf4 3. Bc4 d5 4. Bxd5 Nf6 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, Cozio (Morphy) defence"] + +1. e4 e5 2. f4 exf4 3. Bc4 Nf6 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, Bogolyubov variation"] + +1. e4 e5 2. f4 exf4 3. Bc4 Nf6 4. Nc3 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, Paulsen attack"] + +1. e4 e5 2. f4 exf4 3. Bc4 Nf6 4. Nc3 Bb4 5. e5 * + +[ECO "C33"] +[Opening "KGA"] +[Variation "bishop's gambit, Jaenisch variation"] + +1. e4 e5 2. f4 exf4 3. Bc4 Nf6 4. Nc3 c6 * + +[ECO "C34"] +[Opening "King's knight's gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 * + +[ECO "C34"] +[Opening "KGA"] +[Variation "Bonsch-Osmolovsky variation"] + +1. e4 e5 2. f4 exf4 3. Nf3 Ne7 * + +[ECO "C34"] +[Opening "KGA"] +[Variation "Gianutio counter-gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 f5 * + +[ECO "C34"] +[Opening "KGA"] +[Variation "Fischer defence"] + +1. e4 e5 2. f4 exf4 3. Nf3 d6 * + +[ECO "C34"] +[Opening "KGA"] +[Variation "Becker defence"] + +1. e4 e5 2. f4 exf4 3. Nf3 h6 * + +[ECO "C34"] +[Opening "KGA"] +[Variation "Schallop defence"] + +1. e4 e5 2. f4 exf4 3. Nf3 Nf6 * + +[ECO "C35"] +[Opening "KGA"] +[Variation "Cunningham defence"] + +1. e4 e5 2. f4 exf4 3. Nf3 Be7 * + +[ECO "C35"] +[Opening "KGA"] +[Variation "Cunningham, Bertin gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 Be7 4. Bc4 Bh4+ 5. g3 * + +[ECO "C35"] +[Opening "KGA"] +[Variation "Cunningham, three pawns gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 Be7 4. Bc4 Bh4+ 5. g3 fxg3 6. O-O gxh2+ 7. Kh1 * + +[ECO "C35"] +[Opening "KGA"] +[Variation "Cunningham, Euwe defence"] + +1. e4 e5 2. f4 exf4 3. Nf3 Be7 4. Bc4 Nf6 * + +[ECO "C36"] +[Opening "KGA"] +[Variation "Abbazia defence (classical defence, modern defence[!])"] + +1. e4 e5 2. f4 exf4 3. Nf3 d5 * + +[ECO "C36"] +[Opening "KGA"] +[Variation "Abbazia defence, modern variation"] + +1. e4 e5 2. f4 exf4 3. Nf3 d5 4. exd5 Nf6 * + +[ECO "C36"] +[Opening "KGA"] +[Variation "Abbazia defence, Botvinnik variation"] + +1. e4 e5 2. f4 exf4 3. Nf3 d5 4. exd5 Nf6 5. Bb5+ c6 6. dxc6 bxc6 7. Bc4 +Nd5 * + +[ECO "C37"] +[Opening "KGA"] +[Variation "Quaade gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Nc3 * + +[ECO "C37"] +[Opening "KGA"] +[Variation "Rosentreter gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. d4 * + +[ECO "C37"] +[Opening "KGA"] +[Variation "Soerensen gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. d4 g4 5. Ne5 * + +[ECO "C37"] +[Opening "KGA"] +[Variation "King's knight's gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 * + +[ECO "C37"] +[Opening "KGA"] +[Variation "Blachly gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 Nc6 * + +[ECO "C37"] +[Opening "KGA"] +[Variation "Lolli gambit (wild Muzio gambit)"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. Bxf7+ * + +[ECO "C37"] +[Opening "KGA"] +[Variation "Lolli gambit, Young variation"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. Bxf7+ Kxf7 6. O-O gxf3 7. Qxf3 +Qf6 8. d4 Qxd4+ 9. Be3 Qf6 10. Nc3 * + +[ECO "C37"] +[Opening "KGA"] +[Variation "Ghulam Kassim gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. d4 * + +[ECO "C37"] +[Opening "KGA"] +[Variation "MacDonnell gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. Nc3 * + +[ECO "C37"] +[Opening "KGA"] +[Variation "Salvio gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. Ne5 * + +[ECO "C37"] +[Opening "KGA"] +[Variation "Silberschmidt gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. Ne5 Qh4+ 6. Kf1 Nh6 7. d4 f3 * + +[ECO "C37"] +[Opening "KGA"] +[Variation "Salvio gambit, Anderssen counter-attack"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. Ne5 Qh4+ 6. Kf1 Nh6 7. d4 d6 * + +[ECO "C37"] +[Opening "KGA"] +[Variation "Cochrane gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. Ne5 Qh4+ 6. Kf1 f3 * + +[ECO "C37"] +[Opening "KGA"] +[Variation "Herzfeld gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. Ne5 Qh4+ 6. Kf1 Nc6 * + +[ECO "C37"] +[Opening "KGA"] +[Variation "Muzio gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O * + +[ECO "C37"] +[Opening "KGA"] +[Variation "Muzio gambit, Paulsen variation"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O gxf3 6. Qxf3 Qf6 7. e5 Qxe5 +8. d3 Bh6 9. Nc3 Ne7 10. Bd2 Nbc6 11. Rae1 * + +[ECO "C37"] +[Opening "KGA"] +[Variation "double Muzio gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O gxf3 6. Qxf3 Qf6 7. e5 Qxe5 +8. Bxf7+ * + +[ECO "C37"] +[Opening "KGA"] +[Variation "Muzio gambit, From defence"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O gxf3 6. Qxf3 Qe7 * + +[ECO "C37"] +[Opening "KGA"] +[Variation "Muzio gambit, Holloway defence"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O gxf3 6. Qxf3 Nc6 * + +[ECO "C37"] +[Opening "KGA"] +[Variation "Muzio gambit, Kling and Horwitz counter-attack"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O Qe7 * + +[ECO "C37"] +[Opening "KGA"] +[Variation "Muzio gambit, Brentano defence"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O d5 * + +[ECO "C38"] +[Opening "King's knight's gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 Bg7 * + +[ECO "C38"] +[Opening "KGA"] +[Variation "Hanstein gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 Bg7 5. O-O * + +[ECO "C38"] +[Opening "KGA"] +[Variation "Philidor gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 Bg7 5. h4 * + +[ECO "C38"] +[Opening "KGA"] +[Variation "Greco gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 Bg7 5. h4 h6 6. d4 d6 7. Nc3 c6 8. +hxg5 hxg5 9. Rxh8 Bxh8 10. Ne5 * + +[ECO "C38"] +[Opening "KGA"] +[Variation "Philidor gambit, Schultz variation"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 Bg7 5. h4 h6 6. d4 d6 7. Qd3 * + +[ECO "C39"] +[Opening "King's knight's gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Allgaier gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ng5 * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Allgaier, Horny defence"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ng5 h6 6. Nxf7 Kxf7 7. Qxg4 Nf6 +8. Qxf4 Bd6 * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Allgaier, Thorold variation"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ng5 h6 6. Nxf7 Kxf7 7. d4 * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Allgaier, Cook variation"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ng5 h6 6. Nxf7 Kxf7 7. d4 d5 8. +Bxf4 dxe4 9. Bc4+ Kg7 10. Be5+ * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Allgaier, Blackburne gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ng5 h6 6. Nxf7 Kxf7 7. Nc3 * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Allgaier, Walker attack"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ng5 h6 6. Nxf7 Kxf7 7. Bc4+ * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Allgaier, Urusov attack"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ng5 h6 6. Nxf7 Kxf7 7. Bc4+ d5 8. +Bxd5+ Kg7 9. d4 * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Allgaier, Schlechter defence"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ng5 Nf6 * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Kieseritsky, Paulsen defence"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Bg7 * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Kieseritsky, long whip (Stockwhip, classical) defence"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 h5 * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Kieseritsky, long whip defence, Jaenisch variation"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 h5 6. Bc4 Rh7 7. d4 Bh6 8. +Nc3 * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Kieseritsky, Brentano (Campbell) defence"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 d5 * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Kieseritsky, Brentano defence, Kaplanek variation"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 d5 6. d4 Nf6 7. exd5 Qxd5 8. +Nc3 Bb4 9. Kf2 * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Kieseritsky, Brentano defence"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 d5 6. d4 Nf6 7. Bxf4 * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Kieseritsky, Brentano defence, Caro variation"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 d5 6. d4 Nf6 7. Bxf4 Nxe4 8. +Nd2 * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Kieseritsky, Salvio (Rosenthal) defence"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Qe7 * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Kieseritsky, Salvio defence, Cozio variation"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Qe7 6. d4 f5 7. Bc4 * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Kieseritsky, Polerio defence"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Be7 * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Kieseritsky, Neumann defence"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Nc6 * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Kieseritsky, Kolisch defence"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 d6 * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Kieseritsky, Berlin defence"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Nf6 * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Kieseritsky, Berlin defence, Riviere variation"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Nf6 6. Nxg4 d5 * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Kieseritsky, Berlin defence, 6.Bc4"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Nf6 6. Bc4 * + +[ECO "C39"] +[Opening "KGA"] +[Variation "Kieseritsky, Rice gambit"] + +1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Nf6 6. Bc4 d5 7. exd5 Bd6 8. +O-O * + +[ECO "C40"] +[Opening "King's knight opening"] + +1. e4 e5 2. Nf3 * + +[ECO "C40"] +[Opening "Gunderam defence"] + +1. e4 e5 2. Nf3 Qe7 * + +[ECO "C40"] +[Opening "Greco defence"] + +1. e4 e5 2. Nf3 Qf6 * + +[ECO "C40"] +[Opening "Damiano's defence"] + +1. e4 e5 2. Nf3 f6 * + +[ECO "C40"] +[Opening "QP counter-gambit (elephant gambit)"] + +1. e4 e5 2. Nf3 d5 * + +[ECO "C40"] +[Opening "QP counter-gambit"] +[Variation "Maroczy gambit"] + +1. e4 e5 2. Nf3 d5 3. exd5 Bd6 * + +[ECO "C40"] +[Opening "Latvian counter-gambit"] + +1. e4 e5 2. Nf3 f5 * + +[ECO "C40"] +[Opening "Latvian"] +[Variation "Nimzovich variation"] + +1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. d4 d6 5. Nc4 fxe4 6. Ne3 * + +[ECO "C40"] +[Opening "Latvian"] +[Variation "Fraser defence"] + +1. e4 e5 2. Nf3 f5 3. Nxe5 Nc6 * + +[ECO "C40"] +[Opening "Latvian gambit, 3.Bc4"] + +1. e4 e5 2. Nf3 f5 3. Bc4 * + +[ECO "C40"] +[Opening "Latvian"] +[Variation "Behting variation"] + +1. e4 e5 2. Nf3 f5 3. Bc4 fxe4 4. Nxe5 Qg5 5. Nf7 Qxg2 6. Rf1 d5 7. Nxh8 +Nf6 * + +[ECO "C40"] +[Opening "Latvian"] +[Variation "Polerio variation"] + +1. e4 e5 2. Nf3 f5 3. Bc4 fxe4 4. Nxe5 d5 * + +[ECO "C40"] +[Opening "Latvian"] +[Variation "corkscrew counter-gambit"] + +1. e4 e5 2. Nf3 f5 3. Bc4 fxe4 4. Nxe5 Nf6 * + +[ECO "C41"] +[Opening "Philidor's defence"] + +1. e4 e5 2. Nf3 d6 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Steinitz variation"] + +1. e4 e5 2. Nf3 d6 3. Bc4 Be7 4. c3 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Lopez counter-gambit"] + +1. e4 e5 2. Nf3 d6 3. Bc4 f5 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Lopez counter-gambit, Jaenisch variation"] + +1. e4 e5 2. Nf3 d6 3. Bc4 f5 4. d4 exd4 5. Ng5 Nh6 6. Nxh7 * + +[ECO "C41"] +[Opening "Philidor's defence"] + +1. e4 e5 2. Nf3 d6 3. d4 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Philidor counter-gambit"] + +1. e4 e5 2. Nf3 d6 3. d4 f5 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Philidor counter-gambit, del Rio attack"] + +1. e4 e5 2. Nf3 d6 3. d4 f5 4. dxe5 fxe4 5. Ng5 d5 6. e6 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Philidor counter-gambit, Berger variation"] + +1. e4 e5 2. Nf3 d6 3. d4 f5 4. dxe5 fxe4 5. Ng5 d5 6. e6 Bc5 7. Nc3 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Philidor counter-gambit, Zukertort variation"] + +1. e4 e5 2. Nf3 d6 3. d4 f5 4. Nc3 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "exchange variation"] + +1. e4 e5 2. Nf3 d6 3. d4 exd4 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Boden variation"] + +1. e4 e5 2. Nf3 d6 3. d4 exd4 4. Qxd4 Bd7 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "exchange variation"] + +1. e4 e5 2. Nf3 d6 3. d4 exd4 4. Nxd4 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Paulsen attack"] + +1. e4 e5 2. Nf3 d6 3. d4 exd4 4. Nxd4 d5 5. exd5 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "exchange variation"] + +1. e4 e5 2. Nf3 d6 3. d4 exd4 4. Nxd4 Nf6 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Berger variation"] + +1. e4 e5 2. Nf3 d6 3. d4 exd4 4. Nxd4 Nf6 5. Nc3 Be7 6. Be2 O-O 7. O-O c5 +8. Nf3 Nc6 9. Bg5 Be6 10. Re1 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Larsen variation"] + +1. e4 e5 2. Nf3 d6 3. d4 exd4 4. Nxd4 g6 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Nimzovich (Jaenisch) variation"] + +1. e4 e5 2. Nf3 d6 3. d4 Nf6 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Improved Hanham variation"] + +1. e4 e5 2. Nf3 d6 3. d4 Nf6 4. Nc3 Nbd7 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Nimzovich, Sozin variation"] + +1. e4 e5 2. Nf3 d6 3. d4 Nf6 4. Nc3 Nbd7 5. Bc4 Be7 6. O-O O-O 7. Qe2 c6 8. +a4 exd4 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Nimzovich, Larobok variation"] + +1. e4 e5 2. Nf3 d6 3. d4 Nf6 4. Nc3 Nbd7 5. Bc4 Be7 6. Ng5 O-O 7. Bxf7+ * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Nimzovich variation"] + +1. e4 e5 2. Nf3 d6 3. d4 Nf6 4. dxe5 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Nimzovich, Sokolsky variation"] + +1. e4 e5 2. Nf3 d6 3. d4 Nf6 4. dxe5 Nxe4 5. Nbd2 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Nimzovich, Rellstab variation"] + +1. e4 e5 2. Nf3 d6 3. d4 Nf6 4. dxe5 Nxe4 5. Qd5 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Nimzovich, Locock variation"] + +1. e4 e5 2. Nf3 d6 3. d4 Nf6 4. Ng5 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Nimzovich, Klein variation"] + +1. e4 e5 2. Nf3 d6 3. d4 Nf6 4. Bc4 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Hanham variation"] + +1. e4 e5 2. Nf3 d6 3. d4 Nd7 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Hanham, Krause variation"] + +1. e4 e5 2. Nf3 d6 3. d4 Nd7 4. Bc4 c6 5. O-O * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Hanham, Steiner variation"] + +1. e4 e5 2. Nf3 d6 3. d4 Nd7 4. Bc4 c6 5. O-O Be7 6. dxe5 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Hanham, Kmoch variation"] + +1. e4 e5 2. Nf3 d6 3. d4 Nd7 4. Bc4 c6 5. Ng5 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Hanham, Berger variation"] + +1. e4 e5 2. Nf3 d6 3. d4 Nd7 4. Bc4 c6 5. Ng5 Nh6 6. f4 Be7 7. O-O O-O 8. +c3 d5 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Hanham, Schlechter variation"] + +1. e4 e5 2. Nf3 d6 3. d4 Nd7 4. Bc4 c6 5. Nc3 * + +[ECO "C41"] +[Opening "Philidor"] +[Variation "Hanham, Delmar variation"] + +1. e4 e5 2. Nf3 d6 3. d4 Nd7 4. Bc4 c6 5. c3 * + +[ECO "C42"] +[Opening "Petrov's defence"] + +1. e4 e5 2. Nf3 Nf6 * + +[ECO "C42"] +[Opening "Petrov"] +[Variation "French attack"] + +1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d3 * + +[ECO "C42"] +[Opening "Petrov"] +[Variation "Kaufmann attack"] + +1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. c4 * + +[ECO "C42"] +[Opening "Petrov"] +[Variation "Nimzovich attack"] + +1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. Nc3 * + +[ECO "C42"] +[Opening "Petrov"] +[Variation "Cozio (Lasker) attack"] + +1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. Qe2 * + +[ECO "C42"] +[Opening "Petrov"] +[Variation "classical attack"] + +1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 * + +[ECO "C42"] +[Opening "Petrov"] +[Variation "classical attack, Chigorin variation"] + +1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. O-O Nc6 +8. Re1 * + +[ECO "C42"] +[Opening "Petrov"] +[Variation "classical attack, Berger variation"] + +1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. O-O Nc6 +8. Re1 Bg4 9. c3 f5 10. Nbd2 * + +[ECO "C42"] +[Opening "Petrov"] +[Variation "classical attack, Krause variation"] + +1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. O-O Nc6 +8. Re1 Bg4 9. c3 f5 10. c4 * + +[ECO "C42"] +[Opening "Petrov"] +[Variation "classical attack, Maroczy variation"] + +1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. O-O Nc6 +8. Re1 Bg4 9. c3 f5 10. c4 Bh4 * + +[ECO "C42"] +[Opening "Petrov"] +[Variation "classical attack, Jaenisch variation"] + +1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. O-O Nc6 +8. c4 * + +[ECO "C42"] +[Opening "Petrov"] +[Variation "classical attack, Mason variation"] + +1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. O-O O-O * + +[ECO "C42"] +[Opening "Petrov"] +[Variation "classical attack, Marshall variation"] + +1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bd6 * + +[ECO "C42"] +[Opening "Petrov"] +[Variation "classical attack, Tarrasch variation"] + +1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bd6 7. O-O O-O +8. c4 Bg4 * + +[ECO "C42"] +[Opening "Petrov"] +[Variation "classical attack, Marshall trap"] + +1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bd6 7. O-O O-O +8. c4 Bg4 9. cxd5 f5 10. Re1 Bxh2+ * + +[ECO "C42"] +[Opening "Petrov"] +[Variation "classical attack, close variation"] + +1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 Nf6 * + +[ECO "C42"] +[Opening "Petrov"] +[Variation "Cochrane gambit"] + +1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nxf7 * + +[ECO "C42"] +[Opening "Petrov"] +[Variation "Paulsen attack"] + +1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nc4 * + +[ECO "C42"] +[Opening "Petrov"] +[Variation "Damiano variation"] + +1. e4 e5 2. Nf3 Nf6 3. Nxe5 Nxe4 * + +[ECO "C42"] +[Opening "Petrov three knights game"] + +1. e4 e5 2. Nf3 Nf6 3. Nc3 * + +[ECO "C42"] +[Opening "Petrov"] +[Variation "Italian variation"] + +1. e4 e5 2. Nf3 Nf6 3. Bc4 * + +[ECO "C43"] +[Opening "Petrov"] +[Variation "modern (Steinitz) attack"] + +1. e4 e5 2. Nf3 Nf6 3. d4 * + +[ECO "C43"] +[Opening "Petrov"] +[Variation "modern attack, main line"] + +1. e4 e5 2. Nf3 Nf6 3. d4 exd4 4. e5 Ne4 5. Qxd4 * + +[ECO "C43"] +[Opening "Petrov"] +[Variation "modern attack, Steinitz variation"] + +1. e4 e5 2. Nf3 Nf6 3. d4 exd4 4. e5 Ne4 5. Qe2 * + +[ECO "C43"] +[Opening "Petrov"] +[Variation "modern attack, Bardeleben variation"] + +1. e4 e5 2. Nf3 Nf6 3. d4 exd4 4. e5 Ne4 5. Qe2 Nc5 6. Nxd4 Nc6 * + +[ECO "C43"] +[Opening "Petrov"] +[Variation "Urusov gambit"] + +1. e4 e5 2. Nf3 Nf6 3. d4 exd4 4. Bc4 * + +[ECO "C43"] +[Opening "Petrov"] +[Variation "modern attack, Symmetrical variation"] + +1. e4 e5 2. Nf3 Nf6 3. d4 Nxe4 * + +[ECO "C43"] +[Opening "Petrov"] +[Variation "modern attack, Trifunovic variation"] + +1. e4 e5 2. Nf3 Nf6 3. d4 Nxe4 4. Bd3 d5 5. Nxe5 Bd6 6. O-O O-O 7. c4 Bxe5 +* + +[ECO "C44"] +[Opening "King's pawn game"] + +1. e4 e5 2. Nf3 Nc6 * + +[ECO "C44"] +[Opening "Irish (Chicago) gambit"] + +1. e4 e5 2. Nf3 Nc6 3. Nxe5 Nxe5 4. d4 * + +[ECO "C44"] +[Opening "Konstantinopolsky opening"] + +1. e4 e5 2. Nf3 Nc6 3. g3 * + +[ECO "C44"] +[Opening "Dresden opening"] + +1. e4 e5 2. Nf3 Nc6 3. c4 * + +[ECO "C44"] +[Opening "Inverted Hungarian"] + +1. e4 e5 2. Nf3 Nc6 3. Be2 * + +[ECO "C44"] +[Opening "Inverted Hanham"] + +1. e4 e5 2. Nf3 Nc6 3. Be2 Nf6 4. d3 d5 5. Nbd2 * + +[ECO "C44"] +[Opening "Tayler opening"] + +1. e4 e5 2. Nf3 Nc6 3. Be2 Nf6 4. d4 * + +[ECO "C44"] +[Opening "Ponziani opening"] + +1. e4 e5 2. Nf3 Nc6 3. c3 * + +[ECO "C44"] +[Opening "Ponziani"] +[Variation "Caro variation"] + +1. e4 e5 2. Nf3 Nc6 3. c3 d5 4. Qa4 Bd7 * + +[ECO "C44"] +[Opening "Ponziani"] +[Variation "Leonhardt variation"] + +1. e4 e5 2. Nf3 Nc6 3. c3 d5 4. Qa4 Nf6 * + +[ECO "C44"] +[Opening "Ponziani"] +[Variation "Steinitz variation"] + +1. e4 e5 2. Nf3 Nc6 3. c3 d5 4. Qa4 f6 * + +[ECO "C44"] +[Opening "Ponziani"] +[Variation "Jaenisch counter-attack"] + +1. e4 e5 2. Nf3 Nc6 3. c3 Nf6 * + +[ECO "C44"] +[Opening "Ponziani"] +[Variation "Fraser defence"] + +1. e4 e5 2. Nf3 Nc6 3. c3 Nf6 4. d4 Nxe4 5. d5 Bc5 * + +[ECO "C44"] +[Opening "Ponziani"] +[Variation "Reti variation"] + +1. e4 e5 2. Nf3 Nc6 3. c3 Nge7 * + +[ECO "C44"] +[Opening "Ponziani"] +[Variation "Romanishin variation"] + +1. e4 e5 2. Nf3 Nc6 3. c3 Be7 * + +[ECO "C44"] +[Opening "Ponziani counter-gambit"] + +1. e4 e5 2. Nf3 Nc6 3. c3 f5 * + +[ECO "C44"] +[Opening "Ponziani counter-gambit, Schmidt attack"] + +1. e4 e5 2. Nf3 Nc6 3. c3 f5 4. d4 d6 5. d5 * + +[ECO "C44"] +[Opening "Ponziani counter-gambit, Cordel variation"] + +1. e4 e5 2. Nf3 Nc6 3. c3 f5 4. d4 d6 5. d5 fxe4 6. Ng5 Nb8 7. Nxe4 Nf6 8. +Bd3 Be7 * + +[ECO "C44"] +[Opening "Scotch opening"] + +1. e4 e5 2. Nf3 Nc6 3. d4 * + +[ECO "C44"] +[Opening "Scotch"] +[Variation "Lolli variation"] + +1. e4 e5 2. Nf3 Nc6 3. d4 Nxd4 * + +[ECO "C44"] +[Opening "Scotch"] +[Variation "Cochrane variation"] + +1. e4 e5 2. Nf3 Nc6 3. d4 Nxd4 4. Nxe5 Ne6 5. Bc4 c6 6. O-O Nf6 7. Nxf7 * + +[ECO "C44"] +[Opening "Scotch"] +[Variation "Relfsson gambit ('MacLopez')"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bb5 * + +[ECO "C44"] +[Opening "Scotch"] +[Variation "Goering gambit"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. c3 * + +[ECO "C44"] +[Opening "Scotch"] +[Variation "Sea-cadet mate"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. c3 dxc3 5. Nxc3 d6 6. Bc4 Bg4 7. O-O Ne5 +8. Nxe5 Bxd1 9. Bxf7+ Ke7 10. Nd5# * + +[ECO "C44"] +[Opening "Scotch"] +[Variation "Goering gambit"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. c3 dxc3 5. Nxc3 Bb4 * + +[ECO "C44"] +[Opening "Scotch"] +[Variation "Goering gambit, Bardeleben variation"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. c3 dxc3 5. Nxc3 Bb4 6. Bc4 Nf6 * + +[ECO "C44"] +[Opening "Scotch gambit"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 * + +[ECO "C44"] +[Opening "Scotch gambit"] +[Variation "Anderssen (Paulsen, Suhle) counter-attack"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bc5 5. O-O d6 6. c3 Bg4 * + +[ECO "C44"] +[Opening "Scotch gambit"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bc5 5. Ng5 * + +[ECO "C44"] +[Opening "Scotch gambit"] +[Variation "Cochrane-Shumov defence"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bc5 5. Ng5 Nh6 6. Nxf7 Nxf7 7. Bxf7+ +Kxf7 8. Qh5+ g6 9. Qxc5 d5 * + +[ECO "C44"] +[Opening "Scotch gambit"] +[Variation "Vitzhum attack"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bc5 5. Ng5 Nh6 6. Qh5 * + +[ECO "C44"] +[Opening "Scotch gambit"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bb4+ * + +[ECO "C44"] +[Opening "Scotch gambit"] +[Variation "Hanneken variation"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bb4+ 5. c3 dxc3 6. O-O cxb2 7. Bxb2 +Nf6 8. Ng5 O-O 9. e5 Nxe5 * + +[ECO "C44"] +[Opening "Scotch gambit"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bb4+ 5. c3 dxc3 6. bxc3 * + +[ECO "C44"] +[Opening "Scotch gambit"] +[Variation "Cochrane variation"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bb4+ 5. c3 dxc3 6. bxc3 Ba5 7. e5 * + +[ECO "C44"] +[Opening "Scotch gambit"] +[Variation "Benima defence"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Be7 * + +[ECO "C44"] +[Opening "Scotch gambit"] +[Variation "Dubois-Reti defence"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Nf6 * + +[ECO "C45"] +[Opening "Scotch game"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 * + +[ECO "C45"] +[Opening "Scotch"] +[Variation "Ghulam Kassim variation"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nxd4 5. Qxd4 d6 6. Bd3 * + +[ECO "C45"] +[Opening "Scotch"] +[Variation "Pulling counter-attack"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Qh4 * + +[ECO "C45"] +[Opening "Scotch"] +[Variation "Horwitz attack"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Qh4 5. Nb5 * + +[ECO "C45"] +[Opening "Scotch"] +[Variation "Berger variation"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Qh4 5. Nb5 Bb4+ 6. Nd2 Qxe4+ 7. Be2 +Qxg2 8. Bf3 Qh3 9. Nxc7+ Kd8 10. Nxa8 Nf6 11. a3 * + +[ECO "C45"] +[Opening "Scotch game"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Qh4 5. Nb5 Bb4+ 6. Bd2 * + +[ECO "C45"] +[Opening "Scotch"] +[Variation "Rosenthal variation"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Qh4 5. Nb5 Bb4+ 6. Bd2 Qxe4+ 7. Be2 +Kd8 8. O-O Bxd2 9. Nxd2 Qg6 * + +[ECO "C45"] +[Opening "Scotch"] +[Variation "Fraser attack"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Qh4 5. Nf3 * + +[ECO "C45"] +[Opening "Scotch"] +[Variation "Steinitz variation"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Qh4 5. Nc3 * + +[ECO "C45"] +[Opening "Scotch"] +[Variation "Schmidt variation"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nf6 * + +[ECO "C45"] +[Opening "Scotch"] +[Variation "Mieses variation"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nf6 5. Nxc6 bxc6 6. e5 * + +[ECO "C45"] +[Opening "Scotch"] +[Variation "Tartakower variation"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nf6 5. Nxc6 bxc6 6. Nd2 * + +[ECO "C45"] +[Opening "Scotch game"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 * + +[ECO "C45"] +[Opening "Scotch"] +[Variation "Blackburne attack"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Be3 Qf6 6. c3 Nge7 7. Qd2 * + +[ECO "C45"] +[Opening "Scotch"] +[Variation "Gottschall variation"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Be3 Qf6 6. c3 Nge7 7. Qd2 d5 +8. Nb5 Bxe3 9. Qxe3 O-O 10. Nxc7 Rb8 11. Nxd5 Nxd5 12. exd5 Nb4 * + +[ECO "C45"] +[Opening "Scotch"] +[Variation "Paulsen attack"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Be3 Qf6 6. c3 Nge7 7. Bb5 * + +[ECO "C45"] +[Opening "Scotch"] +[Variation "Paulsen, Gunsberg defence"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Be3 Qf6 6. c3 Nge7 7. Bb5 Nd8 +* + +[ECO "C45"] +[Opening "Scotch"] +[Variation "Meitner variation"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Be3 Qf6 6. c3 Nge7 7. Nc2 * + +[ECO "C45"] +[Opening "Scotch"] +[Variation "Blumenfeld attack"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Be3 Qf6 6. Nb5 * + +[ECO "C45"] +[Opening "Scotch"] +[Variation "Potter variation"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Nb3 * + +[ECO "C45"] +[Opening "Scotch"] +[Variation "Romanishin variation"] + +1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Nb3 Bb4+ * + +[ECO "C46"] +[Opening "Three knights game"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 * + +[ECO "C46"] +[Opening "Three knights"] +[Variation "Schlechter variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Bb4 4. Nd5 Nf6 * + +[ECO "C46"] +[Opening "Three knights"] +[Variation "Winawer defence (Gothic defence)"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 f5 * + +[ECO "C46"] +[Opening "Three knights"] +[Variation "Steinitz variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 g6 * + +[ECO "C46"] +[Opening "Three knights"] +[Variation "Steinitz, Rosenthal variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 g6 4. d4 exd4 5. Nd5 * + +[ECO "C46"] +[Opening "Four knights game"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 * + +[ECO "C46"] +[Opening "Four knights"] +[Variation "Schultze-Mueller gambit"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Nxe5 * + +[ECO "C46"] +[Opening "Four knights"] +[Variation "Italian variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bc4 * + +[ECO "C46"] +[Opening "Four knights"] +[Variation "Gunsberg variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. a3 * + +[ECO "C47"] +[Opening "Four knights"] +[Variation "Scotch variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 * + +[ECO "C47"] +[Opening "Four knights"] +[Variation "Scotch, Krause variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 Bb4 5. Nxe5 * + +[ECO "C47"] +[Opening "Four knights"] +[Variation "Scotch, 4...exd4"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 exd4 * + +[ECO "C47"] +[Opening "Four knights"] +[Variation "Belgrade gambit"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 exd4 5. Nd5 * + +[ECO "C48"] +[Opening "Four knights"] +[Variation "Spanish variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 * + +[ECO "C48"] +[Opening "Four knights"] +[Variation "Ranken variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 a6 5. Bxc6 * + +[ECO "C48"] +[Opening "Four knights"] +[Variation "Spielmann variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 a6 5. Bxc6 dxc6 6. Nxe5 Nxe4 7. Nxe4 +Qd4 8. O-O Qxe5 9. Re1 Be6 10. d4 Qd5 * + +[ECO "C48"] +[Opening "Four knights"] +[Variation "Spanish, classical defence"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bc5 * + +[ECO "C48"] +[Opening "Four knights"] +[Variation "Bardeleben variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bc5 5. O-O O-O 6. Nxe5 Nxe5 7. d4 Bd6 +8. f4 Nc6 9. e5 Bb4 * + +[ECO "C48"] +[Opening "Four knights"] +[Variation "Marshall variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bc5 5. O-O O-O 6. Nxe5 Nd4 * + +[ECO "C48"] +[Opening "Four knights"] +[Variation "Rubinstein counter-gambit"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Nd4 * + +[ECO "C48"] +[Opening "Four knights"] +[Variation "Rubinstein counter-gambit, Bogolyubov variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Nd4 5. Nxe5 Qe7 6. f4 * + +[ECO "C48"] +[Opening "Four knights"] +[Variation "Rubinstein counter-gambit, 5.Be2"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Nd4 5. Be2 * + +[ECO "C48"] +[Opening "Four knights"] +[Variation "Rubinstein counter-gambit Maroczy variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Nd4 5. Be2 Nxf3+ 6. Bxf3 Bc5 7. O-O +O-O 8. d3 d6 9. Na4 Bb6 * + +[ECO "C48"] +[Opening "Four knights"] +[Variation "Rubinstein counter-gambit, exchange variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Nd4 5. Nxd4 * + +[ECO "C48"] +[Opening "Four knights"] +[Variation "Rubinstein counter-gambit, Henneberger variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Nd4 5. O-O * + +[ECO "C49"] +[Opening "Four knights"] +[Variation "double Ruy Lopez"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 * + +[ECO "C49"] +[Opening "Four knights"] +[Variation "Gunsberg counter-attack"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. Nd5 Nxd5 7. exd5 e4 +* + +[ECO "C49"] +[Opening "Four knights"] +[Variation "double Ruy Lopez"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 * + +[ECO "C49"] +[Opening "Four knights"] +[Variation "Alatortsev variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Qe7 7. Ne2 d5 * + +[ECO "C49"] +[Opening "Four knights"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 * + +[ECO "C49"] +[Opening "Four knights"] +[Variation "Janowski variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d6 +8. Re1 * + +[ECO "C49"] +[Opening "Four knights"] +[Variation "Svenonius variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d5 +* + +[ECO "C49"] +[Opening "Four knights"] +[Variation "symmetrical variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 * + +[ECO "C49"] +[Opening "Four knights"] +[Variation "symmetrical, Metger unpin"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 +8. bxc3 Qe7 * + +[ECO "C49"] +[Opening "Four knights"] +[Variation "symmetrical, Capablanca variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 +8. bxc3 Qe7 9. Re1 Nd8 10. d4 Bg4 * + +[ECO "C49"] +[Opening "Four knights"] +[Variation "symmetrical, Pillsbury variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Ne7 * + +[ECO "C49"] +[Opening "Four knights"] +[Variation "symmetrical, Blake variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Ne7 8. +Nh4 c6 9. Bc4 d5 10. Bb3 Qd6 * + +[ECO "C49"] +[Opening "Four knights"] +[Variation "symmetrical, Tarrasch variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Be6 * + +[ECO "C49"] +[Opening "Four knights"] +[Variation "symmetrical, Maroczy system"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Ne2 * + +[ECO "C49"] +[Opening "Four knights"] +[Variation "Nimzovich (Paulsen) variation"] + +1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. Bxc6 * + +[ECO "C50"] +[Opening "King's pawn game"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 * + +[ECO "C50"] +[Opening "Blackburne shilling gambit"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nd4 4. Nxe5 Qg5 5. Nxf7 Qxg2 6. Rf1 Qxe4+ 7. Be2 +Nf3# * + +[ECO "C50"] +[Opening "Rousseau gambit"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 f5 * + +[ECO "C50"] +[Opening "Hungarian defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Be7 * + +[ECO "C50"] +[Opening "Hungarian defence"] +[Variation "Tartakower variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Be7 4. d4 exd4 5. c3 Nf6 6. e5 Ne4 * + +[ECO "C50"] +[Opening "Giuoco Piano"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 * + +[ECO "C50"] +[Opening "Giuoco Piano"] +[Variation "four knights variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. Nc3 Nf6 * + +[ECO "C50"] +[Opening "Giuoco Piano"] +[Variation "Jerome gambit"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. Bxf7+ * + +[ECO "C50"] +[Opening "Giuoco Pianissimo"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d3 * + +[ECO "C50"] +[Opening "Giuoco Pianissimo"] +[Variation "Dubois variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d3 f5 5. Ng5 f4 * + +[ECO "C50"] +[Opening "Giuoco Pianissimo"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d3 Nf6 * + +[ECO "C50"] +[Opening "Giuoco Pianissimo"] +[Variation "Italian four knights variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d3 Nf6 5. Nc3 * + +[ECO "C50"] +[Opening "Giuoco Pianissimo"] +[Variation "Canal variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d3 Nf6 5. Nc3 d6 6. Bg5 * + +[ECO "C51"] +[Opening "Evans gambit declined"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 * + +[ECO "C51"] +[Opening "Evans gambit declined, Lange variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bb6 5. b5 Na5 6. Nxe5 Nh6 * + +[ECO "C51"] +[Opening "Evans gambit declined, Pavlov variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bb6 5. b5 Na5 6. Nxe5 Nh6 7. d4 d6 8. +Bxh6 dxe5 9. Bxg7 Rg8 10. Bxf7+ Kxf7 11. Bxe5 Qg5 12. Nd2 * + +[ECO "C51"] +[Opening "Evans gambit declined, Hirschbach variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bb6 5. b5 Na5 6. Nxe5 Qg5 * + +[ECO "C51"] +[Opening "Evans gambit declined, Vasquez variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bb6 5. b5 Na5 6. Nxe5 Qg5 7. Bxf7+ Ke7 +8. Qh5 * + +[ECO "C51"] +[Opening "Evans gambit declined, Hicken variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bb6 5. b5 Na5 6. Nxe5 Qg5 7. Qf3 Qxe5 +8. Qxf7+ Kd8 9. Bb2 * + +[ECO "C51"] +[Opening "Evans gambit declined, 5.a4"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bb6 5. a4 * + +[ECO "C51"] +[Opening "Evans gambit declined, Showalter variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bb6 5. a4 a6 6. Nc3 * + +[ECO "C51"] +[Opening "Evans gambit declined, Cordel variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bb6 5. Bb2 * + +[ECO "C51"] +[Opening "Evans counter-gambit"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 d5 * + +[ECO "C51"] +[Opening "Evans gambit"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 * + +[ECO "C51"] +[Opening "Evans gambit"] +[Variation "normal variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bc5 6. d4 exd4 7. O-O d6 8. +cxd4 Bb6 * + +[ECO "C51"] +[Opening "Evans gambit"] +[Variation "Ulvestad variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bc5 6. d4 exd4 7. O-O d6 8. +cxd4 Bb6 9. d5 Na5 10. Bb2 * + +[ECO "C51"] +[Opening "Evans gambit"] +[Variation "Paulsen variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bc5 6. d4 exd4 7. O-O d6 8. +cxd4 Bb6 9. d5 Na5 10. Bb2 Ne7 * + +[ECO "C51"] +[Opening "Evans gambit"] +[Variation "Morphy attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bc5 6. d4 exd4 7. O-O d6 8. +cxd4 Bb6 9. Nc3 * + +[ECO "C51"] +[Opening "Evans gambit"] +[Variation "Goering attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bc5 6. d4 exd4 7. O-O d6 8. +cxd4 Bb6 9. Nc3 Na5 10. Bg5 * + +[ECO "C51"] +[Opening "Evans gambit"] +[Variation "Steinitz variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bc5 6. d4 exd4 7. O-O d6 8. +cxd4 Bb6 9. Nc3 Na5 10. Bg5 f6 11. Be3 * + +[ECO "C51"] +[Opening "Evans gambit"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bc5 6. d4 exd4 7. O-O d6 8. +cxd4 Bb6 9. Nc3 Bg4 * + +[ECO "C51"] +[Opening "Evans gambit"] +[Variation "Fraser attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bc5 6. d4 exd4 7. O-O d6 8. +cxd4 Bb6 9. Nc3 Bg4 10. Qa4 * + +[ECO "C51"] +[Opening "Evans gambit"] +[Variation "Fraser-Mortimer attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bc5 6. d4 exd4 7. O-O d6 8. +cxd4 Bb6 9. Nc3 Bg4 10. Qa4 Bd7 11. Qb3 Na5 12. Bxf7+ Kf8 13. Qc2 * + +[ECO "C51"] +[Opening "Evans gambit"] +[Variation "Stone-Ware variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bd6 * + +[ECO "C51"] +[Opening "Evans gambit"] +[Variation "Mayet defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bf8 * + +[ECO "C51"] +[Opening "Evans gambit"] +[Variation "5...Be7"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Be7 * + +[ECO "C51"] +[Opening "Evans gambit"] +[Variation "Cordel variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Be7 6. d4 Na5 * + +[ECO "C52"] +[Opening "Evans gambit"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 * + +[ECO "C52"] +[Opening "Evans gambit"] +[Variation "compromised defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 exd4 7. O-O dxc3 +* + +[ECO "C52"] +[Opening "Evans gambit"] +[Variation "compromised defence, Paulsen variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 exd4 7. O-O dxc3 +8. Qb3 Qf6 9. e5 Qg6 10. Nxc3 Nge7 11. Ba3 * + +[ECO "C52"] +[Opening "Evans gambit"] +[Variation "compromised defence, Potter variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 exd4 7. O-O dxc3 +8. Qb3 Qf6 9. e5 Qg6 10. Nxc3 Nge7 11. Rd1 * + +[ECO "C52"] +[Opening "Evans gambit"] +[Variation "Leonhardt variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 b5 * + +[ECO "C52"] +[Opening "Evans gambit"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 d6 * + +[ECO "C52"] +[Opening "Evans gambit"] +[Variation "Tartakower attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 d6 7. Qb3 * + +[ECO "C52"] +[Opening "Evans gambit"] +[Variation "Levenfish variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 d6 7. Qb3 Qd7 8. +dxe5 dxe5 9. O-O Bb6 10. Ba3 Na5 11. Nxe5 * + +[ECO "C52"] +[Opening "Evans gambit"] +[Variation "Sokolsky variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 d6 7. Bg5 * + +[ECO "C52"] +[Opening "Evans gambit"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. O-O * + +[ECO "C52"] +[Opening "Evans gambit"] +[Variation "Richardson attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. O-O Nf6 7. d4 O-O 8. +Nxe5 * + +[ECO "C52"] +[Opening "Evans gambit"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. O-O d6 * + +[ECO "C52"] +[Opening "Evans gambit"] +[Variation "Waller attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. O-O d6 7. d4 exd4 8. +Qb3 * + +[ECO "C52"] +[Opening "Evans gambit"] +[Variation "Lasker defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. O-O d6 7. d4 Bb6 * + +[ECO "C52"] +[Opening "Evans gambit"] +[Variation "Sanders-Alapin variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. O-O d6 7. d4 Bd7 * + +[ECO "C52"] +[Opening "Evans gambit"] +[Variation "Alapin-Steinitz variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. O-O d6 7. d4 Bg4 * + +[ECO "C53"] +[Opening "Giuoco Piano"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 * + +[ECO "C53"] +[Opening "Giuoco Piano"] +[Variation "LaBourdonnais variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 d6 5. d4 exd4 6. cxd4 Bb6 * + +[ECO "C53"] +[Opening "Giuoco Piano"] +[Variation "close variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Qe7 * + +[ECO "C53"] +[Opening "Giuoco Piano"] +[Variation "centre-holding variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Qe7 5. d4 Bb6 * + +[ECO "C53"] +[Opening "Giuoco Piano"] +[Variation "Tarrasch variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Qe7 5. d4 Bb6 6. O-O Nf6 7. a4 a6 8. +Re1 d6 9. h3 * + +[ECO "C53"] +[Opening "Giuoco Piano"] +[Variation "Mestel variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Qe7 5. d4 Bb6 6. Bg5 * + +[ECO "C53"] +[Opening "Giuoco Piano"] +[Variation "Eisinger variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Qe7 5. d4 Bb6 6. d5 Nb8 7. d6 * + +[ECO "C53"] +[Opening "Giuoco Piano"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 * + +[ECO "C53"] +[Opening "Giuoco Piano"] +[Variation "Bird's attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. b4 * + +[ECO "C53"] +[Opening "Giuoco Piano"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 * + +[ECO "C53"] +[Opening "Giuoco Piano"] +[Variation "Ghulam Kassim variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. e5 Ne4 7. Bd5 Nxf2 +8. Kxf2 dxc3+ 9. Kg3 * + +[ECO "C53"] +[Opening "Giuoco Piano"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. e5 d5 * + +[ECO "C53"] +[Opening "Giuoco Piano"] +[Variation "Anderssen variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. e5 d5 7. Bb5 Ne4 8. +cxd4 Bb4+ * + +[ECO "C54"] +[Opening "Giuoco Piano"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 * + +[ECO "C54"] +[Opening "Giuoco Piano"] +[Variation "Krause variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Bd2 +Nxe4 8. Bxb4 Nxb4 9. Bxf7+ Kxf7 10. Qb3+ d5 11. Ne5+ Kf6 12. f3 * + +[ECO "C54"] +[Opening "Giuoco Piano"] +[Variation "Cracow variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Kf1 * + +[ECO "C54"] +[Opening "Giuoco Piano"] +[Variation "Greco's attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Nc3 * + +[ECO "C54"] +[Opening "Giuoco Piano"] +[Variation "Greco variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Nc3 +Nxe4 8. O-O Nxc3 * + +[ECO "C54"] +[Opening "Giuoco Piano"] +[Variation "Bernstein variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Nc3 +Nxe4 8. O-O Nxc3 9. bxc3 Bxc3 10. Qb3 d5 * + +[ECO "C54"] +[Opening "Giuoco Piano"] +[Variation "Aitken variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Nc3 +Nxe4 8. O-O Nxc3 9. bxc3 Bxc3 10. Ba3 * + +[ECO "C54"] +[Opening "Giuoco Piano"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Nc3 +Nxe4 8. O-O Bxc3 * + +[ECO "C54"] +[Opening "Giuoco Piano"] +[Variation "Steinitz variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Nc3 +Nxe4 8. O-O Bxc3 9. bxc3 d5 10. Ba3 * + +[ECO "C54"] +[Opening "Giuoco Piano"] +[Variation "Moeller (Therkatz) attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Nc3 +Nxe4 8. O-O Bxc3 9. d5 * + +[ECO "C54"] +[Opening "Giuoco Piano"] +[Variation "Therkatz-Herzog variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Nc3 +Nxe4 8. O-O Bxc3 9. d5 Bf6 10. Re1 Ne7 11. Rxe4 d6 12. Bg5 Bxg5 13. Nxg5 +O-O 14. Nxh7 * + +[ECO "C54"] +[Opening "Giuoco Piano"] +[Variation "Moeller, bayonet attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Nc3 +Nxe4 8. O-O Bxc3 9. d5 Bf6 10. Re1 Ne7 11. Rxe4 d6 12. g4 * + +[ECO "C55"] +[Opening "Two knights defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 * + +[ECO "C55"] +[Opening "Giuoco piano"] +[Variation "Rosentreter variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. O-O Bc5 5. d4 Bxd4 6. Nxd4 Nxd4 7. Bg5 h6 +8. Bh4 g5 9. f4 * + +[ECO "C55"] +[Opening "Giuoco piano"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. O-O Bc5 5. d4 Bxd4 6. Nxd4 Nxd4 7. Bg5 d6 +* + +[ECO "C55"] +[Opening "Giuoco piano"] +[Variation "Holzhausen attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. O-O Bc5 5. d4 Bxd4 6. Nxd4 Nxd4 7. Bg5 d6 +8. f4 Qe7 9. fxe5 dxe5 10. Nc3 * + +[ECO "C55"] +[Opening "Two knights defence (Modern bishop's opening)"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d3 * + +[ECO "C55"] +[Opening "Two knights defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 * + +[ECO "C55"] +[Opening "Two knights defence, Keidanz variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. e5 d5 6. Bb5 Ne4 7. Nxd4 Bc5 +8. Nxc6 Bxf2+ 9. Kf1 Qh4 * + +[ECO "C55"] +[Opening "Two knights defence, Perreux variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. Ng5 * + +[ECO "C55"] +[Opening "Two knights defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O * + +[ECO "C55"] +[Opening "two knights"] +[Variation "Max Lange attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Bc5 6. e5 * + +[ECO "C55"] +[Opening "two knights"] +[Variation "Max Lange attack, Berger variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Bc5 6. e5 d5 7. exf6 dxc4 +8. Re1+ Be6 9. Ng5 Qd5 10. Nc3 Qf5 11. g4 Qg6 12. Nce4 Bb6 13. f4 O-O-O * + +[ECO "C55"] +[Opening "two knights"] +[Variation "Max Lange attack, Marshall variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Bc5 6. e5 d5 7. exf6 dxc4 +8. Re1+ Be6 9. Ng5 Qd5 10. Nc3 Qf5 11. Nce4 * + +[ECO "C55"] +[Opening "two knights"] +[Variation "Max Lange attack, Rubinstein variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Bc5 6. e5 d5 7. exf6 dxc4 +8. Re1+ Be6 9. Ng5 Qd5 10. Nc3 Qf5 11. Nce4 Bf8 * + +[ECO "C55"] +[Opening "two knights"] +[Variation "Max Lange attack, Loman defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Bc5 6. e5 d5 7. exf6 dxc4 +8. Re1+ Be6 9. Ng5 g6 * + +[ECO "C55"] +[Opening "two knights"] +[Variation "Max Lange attack, Schlechter variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Bc5 6. e5 d5 7. exf6 dxc4 +8. Re1+ Be6 9. fxg7 * + +[ECO "C55"] +[Opening "two knights"] +[Variation "Max Lange attack, Steinitz variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Bc5 6. e5 Ng4 * + +[ECO "C55"] +[Opening "two knights"] +[Variation "Max Lange attack, Krause variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Bc5 6. e5 Ng4 7. c3 * + +[ECO "C56"] +[Opening "Two knights defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Nxe4 * + +[ECO "C56"] +[Opening "two knights defence"] +[Variation "Yurdansky attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Nxe4 6. Re1 d5 7. Bxd5 +Qxd5 8. Nc3 Qa5 9. Nxe4 Be6 10. Bg5 h6 11. Bh4 g5 12. Nf6+ Ke7 13. b4 * + +[ECO "C56"] +[Opening "two knights defence"] +[Variation "Canal variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Nxe4 6. Re1 d5 7. Nc3 * + +[ECO "C57"] +[Opening "Two knights defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 * + +[ECO "C57"] +[Opening "two knights defence"] +[Variation "Wilkes Barre (Traxler) variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 Bc5 * + +[ECO "C57"] +[Opening "two knights defence"] +[Variation "Ulvestad variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 b5 * + +[ECO "C57"] +[Opening "two knights defence"] +[Variation "Fritz variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nd4 * + +[ECO "C57"] +[Opening "two knights defence"] +[Variation "Fritz, Gruber variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nd4 6. c3 b5 7. Bf1 Nxd5 +8. Ne4 * + +[ECO "C57"] +[Opening "two knights defence"] +[Variation "Lolli attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nxd5 6. d4 * + +[ECO "C57"] +[Opening "two knights defence"] +[Variation "Pincus variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nxd5 6. d4 Bb4+ * + +[ECO "C57"] +[Opening "two knights defence"] +[Variation "Fegatello attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nxd5 6. Nxf7 * + +[ECO "C57"] +[Opening "two knights defence"] +[Variation "Fegatello attack, Leonhardt variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nxd5 6. Nxf7 Kxf7 7. Qf3+ +Ke6 8. Nc3 Nb4 9. Qe4 c6 10. a3 Na6 11. d4 Nc7 * + +[ECO "C57"] +[Opening "two knights defence"] +[Variation "Fegatello attack, Polerio defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nxd5 6. Nxf7 Kxf7 7. Qf3+ +Ke6 8. Nc3 Ne7 * + +[ECO "C58"] +[Opening "two knights defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 * + +[ECO "C58"] +[Opening "two knights defence"] +[Variation "Kieseritsky variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. d3 * + +[ECO "C58"] +[Opening "two knights defence"] +[Variation "Yankovich variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. d3 h6 7. Nf3 e4 8. +Qe2 Nxc4 9. dxc4 Bc5 10. Nfd2 * + +[ECO "C58"] +[Opening "two knights defence"] +[Variation "Maroczy variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. d3 h6 7. Nf3 e4 8. +Qe2 Nxc4 9. dxc4 Be7 * + +[ECO "C58"] +[Opening "Two knights defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ * + +[ECO "C58"] +[Opening "two knights defence"] +[Variation "Bogolyubov variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ c6 7. dxc6 +bxc6 8. Qf3 * + +[ECO "C58"] +[Opening "two knights defence"] +[Variation "Paoli variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ c6 7. dxc6 +bxc6 8. Qf3 Qc7 9. Bd3 * + +[ECO "C58"] +[Opening "two knights defence"] +[Variation "Colman variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ c6 7. dxc6 +bxc6 8. Qf3 Rb8 * + +[ECO "C58"] +[Opening "two knights defence"] +[Variation "Blackburne variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ c6 7. dxc6 +bxc6 8. Qf3 cxb5 * + +[ECO "C58"] +[Opening "Two knights defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ c6 7. dxc6 +bxc6 8. Be2 * + +[ECO "C59"] +[Opening "Two knights defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ c6 7. dxc6 +bxc6 8. Be2 h6 * + +[ECO "C59"] +[Opening "two knights defence"] +[Variation "Knorre variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ c6 7. dxc6 +bxc6 8. Be2 h6 9. Nf3 e4 10. Ne5 Bd6 11. d4 Qc7 12. Bd2 * + +[ECO "C59"] +[Opening "two knights defence"] +[Variation "Goering variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ c6 7. dxc6 +bxc6 8. Be2 h6 9. Nf3 e4 10. Ne5 Qc7 * + +[ECO "C59"] +[Opening "two knights defence"] +[Variation "Steinitz variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ c6 7. dxc6 +bxc6 8. Be2 h6 9. Nh3 * + +[ECO "C60"] +[Opening "Ruy Lopez (Spanish opening)"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 * + +[ECO "C60"] +[Opening "Ruy Lopez"] +[Variation "Nuernberg variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 f6 * + +[ECO "C60"] +[Opening "Ruy Lopez"] +[Variation "Pollock defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Na5 * + +[ECO "C60"] +[Opening "Ruy Lopez"] +[Variation "Lucena defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Be7 * + +[ECO "C60"] +[Opening "Ruy Lopez"] +[Variation "Vinogradov variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Qe7 * + +[ECO "C60"] +[Opening "Ruy Lopez"] +[Variation "Brentano defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 g5 * + +[ECO "C60"] +[Opening "Ruy Lopez"] +[Variation "fianchetto (Smyslov/Barnes) defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 g6 * + +[ECO "C60"] +[Opening "Ruy Lopez"] +[Variation "Cozio defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nge7 * + +[ECO "C60"] +[Opening "Ruy Lopez"] +[Variation "Cozio defence, Paulsen variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nge7 4. Nc3 g6 * + +[ECO "C61"] +[Opening "Ruy Lopez"] +[Variation "Bird's defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nd4 * + +[ECO "C61"] +[Opening "Ruy Lopez"] +[Variation "Bird's defence, Paulsen variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nd4 4. Nxd4 exd4 5. O-O Ne7 * + +[ECO "C62"] +[Opening "Ruy Lopez"] +[Variation "old Steinitz defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 * + +[ECO "C62"] +[Opening "Ruy Lopez"] +[Variation "old Steinitz defence, Nimzovich attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. d4 Bd7 5. Nc3 Nf6 6. Bxc6 * + +[ECO "C62"] +[Opening "Ruy Lopez"] +[Variation "old Steinitz defence, semi-Duras variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. d4 Bd7 5. c4 * + +[ECO "C63"] +[Opening "Ruy Lopez"] +[Variation "Schliemann defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 f5 * + +[ECO "C63"] +[Opening "Ruy Lopez"] +[Variation "Schliemann defence, Berger variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 f5 4. Nc3 * + +[ECO "C64"] +[Opening "Ruy Lopez"] +[Variation "classical (Cordel) defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 * + +[ECO "C64"] +[Opening "Ruy Lopez"] +[Variation "classical defence, Zaitsev variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. O-O Nd4 5. b4 * + +[ECO "C64"] +[Opening "Ruy Lopez"] +[Variation "classical defence, 4.c3"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. c3 * + +[ECO "C64"] +[Opening "Ruy Lopez"] +[Variation "classical defence, Benelux variation "] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. c3 Nf6 5. O-O O-O 6. d4 Bb6 * + +[ECO "C64"] +[Opening "Ruy Lopez"] +[Variation "classical defence, Charousek variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. c3 Bb6 * + +[ECO "C64"] +[Opening "Ruy Lopez"] +[Variation "classical defence, Boden variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. c3 Qe7 * + +[ECO "C64"] +[Opening "Ruy Lopez"] +[Variation "Cordel gambit"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. c3 f5 * + +[ECO "C65"] +[Opening "Ruy Lopez"] +[Variation "Berlin defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 * + +[ECO "C65"] +[Opening "Ruy Lopez"] +[Variation "Berlin defence, Nyholm attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. d4 exd4 5. O-O * + +[ECO "C65"] +[Opening "Ruy Lopez"] +[Variation "Berlin defence, Mortimer variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. d3 Ne7 * + +[ECO "C65"] +[Opening "Ruy Lopez"] +[Variation "Berlin defence, Mortimer trap"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. d3 Ne7 5. Nxe5 c6 * + +[ECO "C65"] +[Opening "Ruy Lopez"] +[Variation "Berlin defence, Anderssen variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. d3 d6 5. Bxc6+ * + +[ECO "C65"] +[Opening "Ruy Lopez"] +[Variation "Berlin defence, Duras variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. d3 d6 5. c4 * + +[ECO "C65"] +[Opening "Ruy Lopez"] +[Variation "Berlin defence, Kaufmann variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. d3 Bc5 5. Be3 * + +[ECO "C65"] +[Opening "Ruy Lopez"] +[Variation "Berlin defence, 4.O-O"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O * + +[ECO "C65"] +[Opening "Ruy Lopez"] +[Variation "Berlin defence, Beverwijk variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Bc5 * + +[ECO "C66"] +[Opening "Ruy Lopez"] +[Variation "Berlin defence, 4.O-O, d6"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6 * + +[ECO "C66"] +[Opening "Ruy Lopez"] +[Variation "Berlin defence, hedgehog variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6 5. d4 Bd7 6. Nc3 Be7 * + +[ECO "C66"] +[Opening "Ruy Lopez"] +[Variation "Berlin defence, Tarrasch trap"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6 5. d4 Bd7 6. Nc3 Be7 7. Re1 O-O * + +[ECO "C66"] +[Opening "Ruy Lopez"] +[Variation "closed Berlin defence, Bernstein variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6 5. d4 Bd7 6. Nc3 Be7 7. Bg5 * + +[ECO "C66"] +[Opening "Ruy Lopez"] +[Variation "closed Berlin defence, Showalter variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6 5. d4 Bd7 6. Nc3 Be7 7. Bxc6 * + +[ECO "C66"] +[Opening "Ruy Lopez"] +[Variation "closed Berlin defence, Wolf variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6 5. d4 Bd7 6. Nc3 exd4 * + +[ECO "C66"] +[Opening "Ruy Lopez"] +[Variation "closed Berlin defence, Chigorin variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6 5. d4 Nd7 * + +[ECO "C67"] +[Opening "Ruy Lopez"] +[Variation "Berlin defence, open variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 * + +[ECO "C67"] +[Opening "Ruy Lopez"] +[Variation "open Berlin defence, l'Hermet variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Nd6 6. dxe5 * + +[ECO "C67"] +[Opening "Ruy Lopez"] +[Variation "open Berlin defence, Showalter variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Nd6 6. Ba4 * + +[ECO "C67"] +[Opening "Ruy Lopez"] +[Variation "open Berlin defence, 5...Be7"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Be7 * + +[ECO "C67"] +[Opening "Ruy Lopez"] +[Variation "Berlin defence, Rio de Janeiro variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Be7 6. Qe2 Nd6 7. Bxc6 +bxc6 8. dxe5 Nb7 9. Nc3 O-O 10. Re1 Nc5 11. Nd4 Ne6 12. Be3 Nxd4 13. Bxd4 +c5 * + +[ECO "C67"] +[Opening "Ruy Lopez"] +[Variation "Berlin defence, Zukertort variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Be7 6. Qe2 Nd6 7. Bxc6 +bxc6 8. dxe5 Nb7 9. c4 * + +[ECO "C67"] +[Opening "Ruy Lopez"] +[Variation "Berlin defence, Pillsbury variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Be7 6. Qe2 Nd6 7. Bxc6 +bxc6 8. dxe5 Nb7 9. b3 * + +[ECO "C67"] +[Opening "Ruy Lopez"] +[Variation "Berlin defence, Winawer attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Be7 6. Qe2 Nd6 7. Bxc6 +bxc6 8. dxe5 Nb7 9. Nd4 * + +[ECO "C67"] +[Opening "Ruy Lopez"] +[Variation "Berlin defence, Cordel variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Be7 6. Qe2 Nd6 7. Bxc6 +bxc6 8. dxe5 Nf5 * + +[ECO "C67"] +[Opening "Ruy Lopez"] +[Variation "Berlin defence, Trifunovic variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Be7 6. Qe2 d5 * + +[ECO "C67"] +[Opening "Ruy Lopez"] +[Variation "Berlin defence, Minckwitz variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Be7 6. dxe5 * + +[ECO "C67"] +[Opening "Ruy Lopez"] +[Variation "Berlin defence, Rosenthal variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 a6 * + +[ECO "C68"] +[Opening "Ruy Lopez"] +[Variation "exchange variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 * + +[ECO "C68"] +[Opening "Ruy Lopez"] +[Variation "exchange, Alekhine variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. d4 exd4 6. Qxd4 Qxd4 7. Nxd4 +Bd7 * + +[ECO "C68"] +[Opening "Ruy Lopez"] +[Variation "exchange, Keres variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. Nc3 * + +[ECO "C68"] +[Opening "Ruy Lopez"] +[Variation "exchange, Romanovsky variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. Nc3 f6 6. d3 * + +[ECO "C69"] +[Opening "Ruy Lopez"] +[Variation "exchange variation, 5.O-O"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. O-O * + +[ECO "C69"] +[Opening "Ruy Lopez"] +[Variation "exchange variation, Alapin gambit"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. O-O Bg4 6. h3 h5 * + +[ECO "C69"] +[Opening "Ruy Lopez"] +[Variation "exchange, Gligoric variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. O-O f6 * + +[ECO "C69"] +[Opening "Ruy Lopez"] +[Variation "exchange, Bronstein variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. O-O Qd6 * + +[ECO "C70"] +[Opening "Ruy Lopez"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 * + +[ECO "C70"] +[Opening "Ruy Lopez"] +[Variation "fianchetto defence deferred"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 g6 * + +[ECO "C70"] +[Opening "Ruy Lopez"] +[Variation "Cozio defence deferred"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7 * + +[ECO "C70"] +[Opening "Ruy Lopez"] +[Variation "Bird's defence deferred"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nd4 * + +[ECO "C70"] +[Opening "Ruy Lopez"] +[Variation "Alapin's defence deferred"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Bb4 * + +[ECO "C70"] +[Opening "Ruy Lopez"] +[Variation "Classical defence deferred"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Bc5 * + +[ECO "C70"] +[Opening "Ruy Lopez"] +[Variation "Caro variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 b5 * + +[ECO "C70"] +[Opening "Ruy Lopez"] +[Variation "Graz variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 b5 5. Bb3 Bc5 * + +[ECO "C70"] +[Opening "Ruy Lopez"] +[Variation "Taimanov (chase/wing/accelerated counterthrust) variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 b5 5. Bb3 Na5 * + +[ECO "C70"] +[Opening "Ruy Lopez"] +[Variation "Schliemann defence deferred"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 f5 * + +[ECO "C71"] +[Opening "Ruy Lopez"] +[Variation "modern Steinitz defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 * + +[ECO "C71"] +[Opening "Ruy Lopez"] +[Variation "Noah's ark trap"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. d4 b5 6. Bb3 Nxd4 7. Nxd4 exd4 +8. Qxd4 c5 * + +[ECO "C71"] +[Opening "Ruy Lopez"] +[Variation "modern Steinitz defence, Three knights variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. Nc3 * + +[ECO "C71"] +[Opening "Ruy Lopez"] +[Variation "modern Steinitz defence, Duras (Keres) variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. c4 * + +[ECO "C72"] +[Opening "Ruy Lopez"] +[Variation "modern Steinitz defence, 5.O-O"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. O-O * + +[ECO "C73"] +[Opening "Ruy Lopez"] +[Variation "modern Steinitz defence, Richter variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. Bxc6+ bxc6 6. d4 * + +[ECO "C73"] +[Opening "Ruy Lopez"] +[Variation "modern Steinitz defence, Alapin variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. Bxc6+ bxc6 6. d4 f6 * + +[ECO "C74"] +[Opening "Ruy Lopez"] +[Variation "modern Steinitz defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. c3 * + +[ECO "C74"] +[Opening "Ruy Lopez"] +[Variation "modern Steinitz defence, siesta variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. c3 f5 * + +[ECO "C74"] +[Opening "Ruy Lopez"] +[Variation "Siesta, Kopayev variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. c3 f5 6. exf5 Bxf5 7. O-O * + +[ECO "C75"] +[Opening "Ruy Lopez"] +[Variation "modern Steinitz defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. c3 Bd7 * + +[ECO "C75"] +[Opening "Ruy Lopez"] +[Variation "modern Steinitz defence, Rubinstein variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. c3 Bd7 6. d4 Nge7 * + +[ECO "C76"] +[Opening "Ruy Lopez"] +[Variation "modern Steinitz defence, fianchetto (Bronstein) variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. c3 Bd7 6. d4 g6 * + +[ECO "C77"] +[Opening "Ruy Lopez"] +[Variation "Morphy defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 * + +[ECO "C77"] +[Opening "Ruy Lopez"] +[Variation "four knights (Tarrasch) variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. Nc3 * + +[ECO "C77"] +[Opening "Ruy Lopez"] +[Variation "Treybal (Bayreuth) variation (exchange var. deferred)"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. Bxc6 * + +[ECO "C77"] +[Opening "Ruy Lopez"] +[Variation "Wormald (Alapin) attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. Qe2 * + +[ECO "C77"] +[Opening "Ruy Lopez"] +[Variation "Wormald attack, Gruenfeld variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. Qe2 b5 6. Bb3 Be7 7. d4 d6 8. +c3 Bg4 * + +[ECO "C77"] +[Opening "Ruy Lopez"] +[Variation "Anderssen variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. d3 * + +[ECO "C77"] +[Opening "Ruy Lopez"] +[Variation "Morphy defence, Duras variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. d3 d6 6. c4 * + +[ECO "C78"] +[Opening "Ruy Lopez"] +[Variation "5.O-O"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O * + +[ECO "C78"] +[Opening "Ruy Lopez"] +[Variation "Wing attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O b5 6. Bb3 Be7 7. a4 * + +[ECO "C78"] +[Opening "Ruy Lopez"] +[Variation "...b5 & ...d6"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O b5 6. Bb3 d6 * + +[ECO "C78"] +[Opening "Ruy Lopez"] +[Variation "Rabinovich variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O b5 6. Bb3 d6 7. Ng5 d5 8. +exd5 Nd4 9. Re1 Bc5 10. Rxe5+ Kf8 * + +[ECO "C78"] +[Opening "Ruy Lopez"] +[Variation "Archangelsk (counterthrust) variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O b5 6. Bb3 Bb7 * + +[ECO "C78"] +[Opening "Ruy Lopez"] +[Variation "Moeller defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Bc5 * + +[ECO "C79"] +[Opening "Ruy Lopez"] +[Variation "Steinitz defence deferred (Russian defence)"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O d6 * + +[ECO "C79"] +[Opening "Ruy Lopez"] +[Variation "Steinitz defence deferred, Lipnitsky variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O d6 6. Bxc6+ bxc6 7. d4 Bg4 +* + +[ECO "C79"] +[Opening "Ruy Lopez"] +[Variation "Steinitz defence deferred, Rubinstein variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O d6 6. Bxc6+ bxc6 7. d4 Nxe4 +* + +[ECO "C79"] +[Opening "Ruy Lopez"] +[Variation "Steinitz defence deferred, Boleslavsky variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O d6 6. Bxc6+ bxc6 7. d4 Nxe4 +8. Re1 f5 9. dxe5 d5 10. Nc3 * + +[ECO "C80"] +[Opening "Ruy Lopez"] +[Variation "open (Tarrasch) defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 * + +[ECO "C80"] +[Opening "Ruy Lopez"] +[Variation "open, Tartakower variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. Qe2 * + +[ECO "C80"] +[Opening "Ruy Lopez"] +[Variation "open, Knorre variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. Nc3 * + +[ECO "C80"] +[Opening "Ruy Lopez"] +[Variation "open, 6.d4"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 * + +[ECO "C80"] +[Opening "Ruy Lopez"] +[Variation "open, Riga variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 exd4 * + +[ECO "C80"] +[Opening "Ruy Lopez"] +[Variation "open, 6.d4 b5"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 * + +[ECO "C80"] +[Opening "Ruy Lopez"] +[Variation "open, Friess attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Nxe5 * + +[ECO "C80"] +[Opening "Ruy Lopez"] +[Variation "open, Richter variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. d5 * + +[ECO "C80"] +[Opening "Ruy Lopez"] +[Variation "open, 7.Bb3"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 * + +[ECO "C80"] +[Opening "Ruy Lopez"] +[Variation "open, Schlechter defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. +a4 Nxd4 * + +[ECO "C80"] +[Opening "Ruy Lopez"] +[Variation "open, Berger variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. +a4 Nxd4 9. Nxd4 exd4 10. Nc3 * + +[ECO "C80"] +[Opening "Ruy Lopez"] +[Variation "open, Harksen gambit"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. +c4 * + +[ECO "C80"] +[Opening "Ruy Lopez"] +[Variation "open, 8.de"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. +dxe5 * + +[ECO "C80"] +[Opening "Ruy Lopez"] +[Variation "open, Zukertort variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. +dxe5 Ne7 * + +[ECO "C80"] +[Opening "Ruy Lopez"] +[Variation "open, 8...Be6"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. +dxe5 Be6 * + +[ECO "C80"] +[Opening "Ruy Lopez"] +[Variation "open, Bernstein variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. +dxe5 Be6 9. Nbd2 * + +[ECO "C80"] +[Opening "Ruy Lopez"] +[Variation "open, Bernstein variation, Karpov gambit"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. +dxe5 Be6 9. Nbd2 Nc5 10. c3 d4 11. Ng5 * + +[ECO "C81"] +[Opening "Ruy Lopez"] +[Variation "open, Howell attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. +dxe5 Be6 9. Qe2 * + +[ECO "C81"] +[Opening "Ruy Lopez"] +[Variation "open, Howell attack, Ekstroem variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. +dxe5 Be6 9. Qe2 Be7 10. Rd1 O-O 11. c4 bxc4 12. Bxc4 Qd7 * + +[ECO "C81"] +[Opening "Ruy Lopez"] +[Variation "open, Howell attack, Adam variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. +dxe5 Be6 9. Qe2 Be7 10. c4 * + +[ECO "C82"] +[Opening "Ruy Lopez"] +[Variation "open, 9.c3"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. +dxe5 Be6 9. c3 * + +[ECO "C82"] +[Opening "Ruy Lopez"] +[Variation "open, Berlin variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. +dxe5 Be6 9. c3 Nc5 * + +[ECO "C82"] +[Opening "Ruy Lopez"] +[Variation "open, Italian variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. +dxe5 Be6 9. c3 Bc5 * + +[ECO "C82"] +[Opening "Ruy Lopez"] +[Variation "open, St. Petersburg variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. +dxe5 Be6 9. c3 Bc5 10. Nbd2 * + +[ECO "C82"] +[Opening "Ruy Lopez"] +[Variation "open, Dilworth variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. +dxe5 Be6 9. c3 Bc5 10. Nbd2 O-O 11. Bc2 Nxf2 * + +[ECO "C82"] +[Opening "Ruy Lopez"] +[Variation "open, Motzko attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. +dxe5 Be6 9. c3 Bc5 10. Qd3 * + +[ECO "C82"] +[Opening "Ruy Lopez"] +[Variation "open, Motzko attack, Nenarokov variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. +dxe5 Be6 9. c3 Bc5 10. Qd3 Ne7 * + +[ECO "C83"] +[Opening "Ruy Lopez"] +[Variation "open, classical defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. +dxe5 Be6 9. c3 Be7 * + +[ECO "C83"] +[Opening "Ruy Lopez"] +[Variation "open, Malkin variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. +dxe5 Be6 9. c3 Be7 10. Nbd2 O-O 11. Qe2 * + +[ECO "C83"] +[Opening "Ruy Lopez"] +[Variation "open, 9...Be7, 10.Re1"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. +dxe5 Be6 9. c3 Be7 10. Re1 * + +[ECO "C83"] +[Opening "Ruy Lopez"] +[Variation "open, Tarrasch trap"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. +dxe5 Be6 9. c3 Be7 10. Re1 O-O 11. Nd4 Qd7 12. Nxe6 fxe6 13. Rxe4 * + +[ECO "C83"] +[Opening "Ruy Lopez"] +[Variation "open, Breslau variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. +dxe5 Be6 9. c3 Be7 10. Re1 O-O 11. Nd4 Nxe5 * + +[ECO "C84"] +[Opening "Ruy Lopez"] +[Variation "closed defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 * + +[ECO "C84"] +[Opening "Ruy Lopez"] +[Variation "closed, centre attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. d4 * + +[ECO "C84"] +[Opening "Ruy Lopez"] +[Variation "closed, Basque gambit (North Spanish variation)"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. d4 exd4 7. e5 Ne4 8. +c3 * + +[ECO "C85"] +[Opening "Ruy Lopez"] +[Variation "Exchange variation doubly deferred (DERLD)"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Bxc6 * + +[ECO "C86"] +[Opening "Ruy Lopez"] +[Variation "Worrall attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Qe2 * + +[ECO "C86"] +[Opening "Ruy Lopez"] +[Variation "Worrall attack, sharp line"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Qe2 b5 7. Bb3 O-O * + +[ECO "C86"] +[Opening "Ruy Lopez"] +[Variation "Worrall attack, solid line"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Qe2 b5 7. Bb3 d6 * + +[ECO "C87"] +[Opening "Ruy Lopez"] +[Variation "closed, Averbach variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 d6 * + +[ECO "C88"] +[Opening "Ruy Lopez"] +[Variation "closed"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 * + +[ECO "C88"] +[Opening "Ruy Lopez"] +[Variation "closed, Leonhardt variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. +c3 Na5 9. Bc2 c5 10. d4 Qc7 11. h3 Nc6 12. d5 Nb8 13. Nbd2 g5 * + +[ECO "C88"] +[Opening "Ruy Lopez"] +[Variation "closed, Balla variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. +c3 Na5 9. Bc2 c5 10. d4 Qc7 11. a4 * + +[ECO "C88"] +[Opening "Ruy Lopez"] +[Variation "closed, 7...d6, 8.d4"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. +d4 * + +[ECO "C88"] +[Opening "Ruy Lopez"] +[Variation "Noah's ark trap"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. +d4 Nxd4 9. Nxd4 exd4 10. Qxd4 c5 * + +[ECO "C88"] +[Opening "Ruy Lopez"] +[Variation "Trajkovic counter-attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 Bb7 * + +[ECO "C88"] +[Opening "Ruy Lopez"] +[Variation "closed, 7...O-O"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O * + +[ECO "C88"] +[Opening "Ruy Lopez"] +[Variation "closed, anti-Marshall 8.a4"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +a4 * + +[ECO "C88"] +[Opening "Ruy Lopez"] +[Variation "closed, 8.c3"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 * + +[ECO "C89"] +[Opening "Ruy Lopez"] +[Variation "Marshall counter-attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d5 * + +[ECO "C89"] +[Opening "Ruy Lopez"] +[Variation "Marshall counter-attack, 11...c6"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d5 9. exd5 Nxd5 10. Nxe5 Nxe5 11. Rxe5 c6 * + +[ECO "C89"] +[Opening "Ruy Lopez"] +[Variation "Marshall, Kevitz variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d5 9. exd5 Nxd5 10. Nxe5 Nxe5 11. Rxe5 c6 12. Bxd5 cxd5 13. d4 Bd6 14. +Re3 * + +[ECO "C89"] +[Opening "Ruy Lopez"] +[Variation "Marshall, main line, 12.d2d4"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d5 9. exd5 Nxd5 10. Nxe5 Nxe5 11. Rxe5 c6 12. d4 * + +[ECO "C89"] +[Opening "Ruy Lopez"] +[Variation "Marshall, main line, 14...Qh3"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d5 9. exd5 Nxd5 10. Nxe5 Nxe5 11. Rxe5 c6 12. d4 Bd6 13. Re1 Qh4 14. g3 +Qh3 * + +[ECO "C89"] +[Opening "Ruy Lopez"] +[Variation "Marshall, main line, Spassky variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d5 9. exd5 Nxd5 10. Nxe5 Nxe5 11. Rxe5 c6 12. d4 Bd6 13. Re1 Qh4 14. g3 +Qh3 15. Be3 Bg4 16. Qd3 Rae8 17. Nd2 Re6 18. a4 Qh5 * + +[ECO "C89"] +[Opening "Ruy Lopez"] +[Variation "Marshall, Herman Steiner variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d5 9. exd5 e4 * + +[ECO "C90"] +[Opening "Ruy Lopez"] +[Variation "closed (with ...d6)"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 * + +[ECO "C90"] +[Opening "Ruy Lopez"] +[Variation "closed, Pilnik variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. d3 * + +[ECO "C90"] +[Opening "Ruy Lopez"] +[Variation "closed, Lutikov variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. Bc2 * + +[ECO "C90"] +[Opening "Ruy Lopez"] +[Variation "closed, Suetin variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. a3 * + +[ECO "C91"] +[Opening "Ruy Lopez"] +[Variation "closed, 9.d4"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. d4 * + +[ECO "C91"] +[Opening "Ruy Lopez"] +[Variation "closed, Bogolyubov variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. d4 Bg4 * + +[ECO "C92"] +[Opening "Ruy Lopez"] +[Variation "closed, 9.h3"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. h3 * + +[ECO "C92"] +[Opening "Ruy Lopez"] +[Variation "closed, Keres (9...a5) variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. h3 a5 * + +[ECO "C92"] +[Opening "Ruy Lopez"] +[Variation "closed, Kholmov variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. h3 Be6 * + +[ECO "C92"] +[Opening "Ruy Lopez"] +[Variation "closed, Ragozin-Petrosian (`Keres') variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. h3 Nd7 * + +[ECO "C92"] +[Opening "Ruy Lopez"] +[Variation "closed, Flohr-Zaitsev system (Lenzerheide variation)"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. h3 Bb7 * + +[ECO "C93"] +[Opening "Ruy Lopez"] +[Variation "closed, Smyslov defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. h3 h6 * + +[ECO "C94"] +[Opening "Ruy Lopez"] +[Variation "closed, Breyer defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. h3 Nb8 * + +[ECO "C95"] +[Opening "Ruy Lopez"] +[Variation "closed, Breyer, 10.d4"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. h3 Nb8 10. d4 * + +[ECO "C95"] +[Opening "Ruy Lopez"] +[Variation "closed, Breyer, Borisenko variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. h3 Nb8 10. d4 Nbd7 * + +[ECO "C95"] +[Opening "Ruy Lopez"] +[Variation "closed, Breyer, Gligoric variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. h3 Nb8 10. d4 Nbd7 11. Nbd2 Bb7 12. Bc2 c5 * + +[ECO "C95"] +[Opening "Ruy Lopez"] +[Variation "closed, Breyer, Simagin variation"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. h3 Nb8 10. d4 Nbd7 11. Nh4 * + +[ECO "C96"] +[Opening "Ruy Lopez"] +[Variation "closed (8...Na5)"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. h3 Na5 10. Bc2 * + +[ECO "C96"] +[Opening "Ruy Lopez"] +[Variation "closed, Rossolimo defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. h3 Na5 10. Bc2 c6 11. d4 Qc7 * + +[ECO "C96"] +[Opening "Ruy Lopez"] +[Variation "closed (10...c5)"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. h3 Na5 10. Bc2 c5 * + +[ECO "C96"] +[Opening "Ruy Lopez"] +[Variation "closed, Borisenko defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. h3 Na5 10. Bc2 c5 11. d4 Nc6 * + +[ECO "C96"] +[Opening "Ruy Lopez"] +[Variation "closed, Keres (...Nd7) defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. h3 Na5 10. Bc2 c5 11. d4 Nd7 * + +[ECO "C97"] +[Opening "Ruy Lopez"] +[Variation "closed, Chigorin defence"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. h3 Na5 10. Bc2 c5 11. d4 Qc7 * + +[ECO "C97"] +[Opening "Ruy Lopez"] +[Variation "closed, Chigorin, Yugoslav system"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. h3 Na5 10. Bc2 c5 11. d4 Qc7 12. Nbd2 Bd7 13. Nf1 Rfe8 14. Ne3 g6 +* + +[ECO "C98"] +[Opening "Ruy Lopez"] +[Variation "closed, Chigorin, 12...Nc6"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. h3 Na5 10. Bc2 c5 11. d4 Qc7 12. Nbd2 Nc6 * + +[ECO "C98"] +[Opening "Ruy Lopez"] +[Variation "closed, Chigorin, Rauzer attack"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. h3 Na5 10. Bc2 c5 11. d4 Qc7 12. Nbd2 Nc6 13. dxc5 * + +[ECO "C99"] +[Opening "Ruy Lopez"] +[Variation "closed, Chigorin, 12...c5d4"] + +1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. +c3 d6 9. h3 Na5 10. Bc2 c5 11. d4 Qc7 12. Nbd2 cxd4 13. cxd4 * + +[ECO "D00"] +[Opening "Queen's pawn game"] + +1. d4 d5 * + +[ECO "D00"] +[Opening "Queen's pawn, Mason variation"] + +1. d4 d5 2. Bf4 * + +[ECO "D00"] +[Opening "Queen's pawn, Mason variation, Steinitz counter-gambit"] + +1. d4 d5 2. Bf4 c5 * + +[ECO "D00"] +[Opening "Levitsky attack (Queen's bishop attack)"] + +1. d4 d5 2. Bg5 * + +[ECO "D00"] +[Opening "Blackmar gambit"] + +1. d4 d5 2. e4 * + +[ECO "D00"] +[Opening "Queen's pawn"] +[Variation "stonewall attack"] + +1. d4 d5 2. e3 Nf6 3. Bd3 * + +[ECO "D00"] +[Opening "Queen's pawn"] +[Variation "Chigorin variation"] + +1. d4 d5 2. Nc3 * + +[ECO "D00"] +[Opening "Queen's pawn"] +[Variation "Anti-Veresov"] + +1. d4 d5 2. Nc3 Bg4 * + +[ECO "D00"] +[Opening "Blackmar-Diemer gambit"] + +1. d4 d5 2. Nc3 Nf6 3. e4 * + +[ECO "D00"] +[Opening "Blackmar-Diemer"] +[Variation "Euwe defence"] + +1. d4 d5 2. Nc3 Nf6 3. e4 dxe4 4. f3 exf3 5. Nxf3 e6 * + +[ECO "D00"] +[Opening "Blackmar-Diemer"] +[Variation "Lemberg counter-gambit"] + +1. d4 d5 2. Nc3 Nf6 3. e4 e5 * + +[ECO "D01"] +[Opening "Richter-Veresov attack"] + +1. d4 d5 2. Nc3 Nf6 3. Bg5 * + +[ECO "D01"] +[Opening "Richter-Veresov attack, Veresov variation"] + +1. d4 d5 2. Nc3 Nf6 3. Bg5 Bf5 4. Bxf6 * + +[ECO "D01"] +[Opening "Richter-Veresov attack, Richter variation"] + +1. d4 d5 2. Nc3 Nf6 3. Bg5 Bf5 4. f3 * + +[ECO "D02"] +[Opening "Queen's pawn game"] + +1. d4 d5 2. Nf3 * + +[ECO "D02"] +[Opening "Queen's pawn game, Chigorin variation"] + +1. d4 d5 2. Nf3 Nc6 * + +[ECO "D02"] +[Opening "Queen's pawn game, Krause variation"] + +1. d4 d5 2. Nf3 c5 * + +[ECO "D02"] +[Opening "Queen's pawn game"] + +1. d4 d5 2. Nf3 Nf6 * + +[ECO "D02"] +[Opening "Queen's bishop game"] + +1. d4 d5 2. Nf3 Nf6 3. Bf4 * + +[ECO "D03"] +[Opening "Torre attack (Tartakower variation)"] + +1. d4 d5 2. Nf3 Nf6 3. Bg5 * + +[ECO "D04"] +[Opening "Queen's pawn game"] + +1. d4 d5 2. Nf3 Nf6 3. e3 * + +[ECO "D05"] +[Opening "Queen's pawn game"] + +1. d4 d5 2. Nf3 Nf6 3. e3 e6 * + +[ECO "D05"] +[Opening "Queen's pawn game, Zukertort variation"] + +1. d4 d5 2. Nf3 Nf6 3. e3 e6 4. Nbd2 c5 5. b3 * + +[ECO "D05"] +[Opening "Queen's pawn game"] + +1. d4 d5 2. Nf3 Nf6 3. e3 e6 4. Bd3 * + +[ECO "D05"] +[Opening "Queen's pawn game, Rubinstein (Colle-Zukertort) variation"] + +1. d4 d5 2. Nf3 Nf6 3. e3 e6 4. Bd3 c5 5. b3 * + +[ECO "D05"] +[Opening "Colle system"] + +1. d4 d5 2. Nf3 Nf6 3. e3 e6 4. Bd3 c5 5. c3 * + +[ECO "D06"] +[Opening "Queen's Gambit"] + +1. d4 d5 2. c4 * + +[ECO "D06"] +[Opening "QGD"] +[Variation "Grau (Sahovic) defence"] + +1. d4 d5 2. c4 Bf5 * + +[ECO "D06"] +[Opening "QGD"] +[Variation "Marshall defence"] + +1. d4 d5 2. c4 Nf6 * + +[ECO "D06"] +[Opening "QGD"] +[Variation "symmetrical (Austrian) defence"] + +1. d4 d5 2. c4 c5 * + +[ECO "D07"] +[Opening "QGD"] +[Variation "Chigorin defence"] + +1. d4 d5 2. c4 Nc6 * + +[ECO "D07"] +[Opening "QGD"] +[Variation "Chigorin defence, Janowski variation"] + +1. d4 d5 2. c4 Nc6 3. Nc3 dxc4 4. Nf3 * + +[ECO "D08"] +[Opening "QGD"] +[Variation "Albin counter-gambit"] + +1. d4 d5 2. c4 e5 * + +[ECO "D08"] +[Opening "QGD"] +[Variation "Albin counter-gambit, Lasker trap"] + +1. d4 d5 2. c4 e5 3. dxe5 d4 4. e3 Bb4+ 5. Bd2 dxe3 * + +[ECO "D08"] +[Opening "QGD"] +[Variation "Albin counter-gambit"] + +1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3 * + +[ECO "D08"] +[Opening "QGD"] +[Variation "Albin counter-gambit, Alapin variation"] + +1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3 Nc6 5. Nbd2 * + +[ECO "D08"] +[Opening "QGD"] +[Variation "Albin counter-gambit, Krenosz variation"] + +1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3 Nc6 5. Nbd2 Bg4 6. h3 Bxf3 7. Nxf3 Bb4+ +8. Bd2 Qe7 * + +[ECO "D08"] +[Opening "QGD"] +[Variation "Albin counter-gambit, Janowski variation"] + +1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3 Nc6 5. Nbd2 f6 * + +[ECO "D08"] +[Opening "QGD"] +[Variation "Albin counter-gambit, Balogh variation"] + +1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3 Nc6 5. Nbd2 Qe7 * + +[ECO "D09"] +[Opening "QGD"] +[Variation "Albin counter-gambit, 5.g3"] + +1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3 Nc6 5. g3 * + +[ECO "D10"] +[Opening "QGD Slav defence"] + +1. d4 d5 2. c4 c6 * + +[ECO "D10"] +[Opening "QGD Slav defence, Alekhine variation"] + +1. d4 d5 2. c4 c6 3. Nc3 dxc4 4. e4 * + +[ECO "D10"] +[Opening "QGD Slav"] +[Variation "Winawer counter-gambit"] + +1. d4 d5 2. c4 c6 3. Nc3 e5 * + +[ECO "D10"] +[Opening "QGD Slav defence"] +[Variation "exchange variation"] + +1. d4 d5 2. c4 c6 3. cxd5 * + +[ECO "D11"] +[Opening "QGD Slav"] +[Variation "3.Nf3"] + +1. d4 d5 2. c4 c6 3. Nf3 * + +[ECO "D11"] +[Opening "QGD Slav"] +[Variation "Breyer variation"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2 * + +[ECO "D11"] +[Opening "QGD Slav"] +[Variation "4.e3"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 * + +[ECO "D12"] +[Opening "QGD Slav"] +[Variation "4.e3 Bf5"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 Bf5 * + +[ECO "D12"] +[Opening "QGD Slav"] +[Variation "Landau variation"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 Bf5 5. cxd5 cxd5 6. Qb3 Qc8 7. Bd2 e6 8. +Na3 * + +[ECO "D12"] +[Opening "QGD Slav"] +[Variation "exchange variation"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 Bf5 5. cxd5 cxd5 6. Nc3 * + +[ECO "D12"] +[Opening "QGD Slav"] +[Variation "Amsterdam variation"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 Bf5 5. cxd5 cxd5 6. Nc3 e6 7. Ne5 Nfd7 * + +[ECO "D13"] +[Opening "QGD Slav"] +[Variation "exchange variation"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. cxd5 cxd5 * + +[ECO "D14"] +[Opening "QGD Slav"] +[Variation "exchange variation, 6.Bf4 Bf5"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. cxd5 cxd5 5. Nc3 Nc6 6. Bf4 Bf5 * + +[ECO "D14"] +[Opening "QGD Slav"] +[Variation "exchange, Trifunovic variation"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. cxd5 cxd5 5. Nc3 Nc6 6. Bf4 Bf5 7. e3 e6 8. +Qb3 Bb4 * + +[ECO "D15"] +[Opening "QGD Slav"] +[Variation "4.Nc3"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 * + +[ECO "D15"] +[Opening "QGD Slav"] +[Variation "Suechting variation"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 Qb6 * + +[ECO "D15"] +[Opening "QGD Slav"] +[Variation "Schlechter variation"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 g6 * + +[ECO "D15"] +[Opening "QGD Slav accepted"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 * + +[ECO "D15"] +[Opening "QGD Slav"] +[Variation "5.e3 (Alekhine variation)"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. e3 * + +[ECO "D15"] +[Opening "QGD Slav"] +[Variation "Slav gambit"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. e4 * + +[ECO "D15"] +[Opening "QGD Slav"] +[Variation "Tolush-Geller gambit"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. e4 b5 6. e5 * + +[ECO "D16"] +[Opening "QGD Slav accepted"] +[Variation "Alapin variation"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 * + +[ECO "D16"] +[Opening "QGD Slav"] +[Variation "Smyslov variation"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Na6 6. e4 Bg4 * + +[ECO "D16"] +[Opening "QGD Slav"] +[Variation "Soultanbeieff variation"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 e6 * + +[ECO "D16"] +[Opening "QGD Slav"] +[Variation "Steiner variation"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bg4 * + +[ECO "D17"] +[Opening "QGD Slav"] +[Variation "Czech defence"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 * + +[ECO "D17"] +[Opening "QGD Slav"] +[Variation "Krause attack"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. Ne5 * + +[ECO "D17"] +[Opening "QGD Slav"] +[Variation "Carlsbad variation"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. Ne5 Nbd7 7. Nxc4 Qc7 +8. g3 e5 * + +[ECO "D17"] +[Opening "QGD Slav"] +[Variation "Wiesbaden variation"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. Ne5 e6 * + +[ECO "D18"] +[Opening "QGD Slav"] +[Variation "Dutch variation"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. e3 * + +[ECO "D18"] +[Opening "QGD Slav"] +[Variation "Dutch, Lasker variation"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. e3 Na6 * + +[ECO "D19"] +[Opening "QGD Slav"] +[Variation "Dutch variation"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. e3 e6 7. Bxc4 Bb4 8. +O-O * + +[ECO "D19"] +[Opening "QGD Slav"] +[Variation "Dutch variation, main line"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. e3 e6 7. Bxc4 Bb4 8. +O-O O-O 9. Qe2 * + +[ECO "D19"] +[Opening "QGD Slav"] +[Variation "Dutch, Saemisch variation"] + +1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. e3 e6 7. Bxc4 Bb4 8. +O-O O-O 9. Qe2 Ne4 10. g4 * + +[ECO "D20"] +[Opening "Queen's gambit accepted"] + +1. d4 d5 2. c4 dxc4 * + +[ECO "D20"] +[Opening "QGA"] +[Variation "3.e4"] + +1. d4 d5 2. c4 dxc4 3. e4 * + +[ECO "D20"] +[Opening "QGA"] +[Variation "Linares variation"] + +1. d4 d5 2. c4 dxc4 3. e4 c5 4. d5 Nf6 5. Nc3 b5 * + +[ECO "D20"] +[Opening "QGA"] +[Variation "Schwartz defence"] + +1. d4 d5 2. c4 dxc4 3. e4 f5 * + +[ECO "D21"] +[Opening "QGA"] +[Variation "3.Nf3"] + +1. d4 d5 2. c4 dxc4 3. Nf3 * + +[ECO "D21"] +[Opening "QGA"] +[Variation "Ericson variation"] + +1. d4 d5 2. c4 dxc4 3. Nf3 b5 * + +[ECO "D21"] +[Opening "QGA"] +[Variation "Alekhine defense, Borisenko-Furman variation"] + +1. d4 d5 2. c4 dxc4 3. Nf3 a6 4. e4 * + +[ECO "D22"] +[Opening "QGA"] +[Variation "Alekhine defence"] + +1. d4 d5 2. c4 dxc4 3. Nf3 a6 * + +[ECO "D22"] +[Opening "QGA"] +[Variation "Alekhine defence, Alatortsev variation"] + +1. d4 d5 2. c4 dxc4 3. Nf3 a6 4. e3 Bg4 5. Bxc4 e6 6. d5 * + +[ECO "D22"] +[Opening "QGA"] +[Variation "Haberditz variation"] + +1. d4 d5 2. c4 dxc4 3. Nf3 a6 4. e3 b5 * + +[ECO "D23"] +[Opening "Queen's gambit accepted"] + +1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 * + +[ECO "D23"] +[Opening "QGA"] +[Variation "Mannheim variation"] + +1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. Qa4+ * + +[ECO "D24"] +[Opening "QGA, 4.Nc3"] + +1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. Nc3 * + +[ECO "D24"] +[Opening "QGA, Bogolyubov variation"] + +1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. Nc3 a6 5. e4 * + +[ECO "D25"] +[Opening "QGA, 4.e3"] + +1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 * + +[ECO "D25"] +[Opening "QGA, Smyslov variation"] + +1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 g6 * + +[ECO "D25"] +[Opening "QGA, Janowsky-Larsen variation"] + +1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 * + +[ECO "D25"] +[Opening "QGA, Flohr variation"] + +1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Be6 * + +[ECO "D26"] +[Opening "QGA"] +[Variation "4...e6"] + +1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 * + +[ECO "D26"] +[Opening "QGA"] +[Variation "classical variation"] + +1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 * + +[ECO "D26"] +[Opening "QGA"] +[Variation "classical, Furman variation"] + +1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. Qe2 a6 7. dxc5 Bxc5 +8. O-O Nc6 9. e4 b5 10. e5 * + +[ECO "D26"] +[Opening "QGA"] +[Variation "classical variation, 6.O-O"] + +1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O * + +[ECO "D26"] +[Opening "QGA"] +[Variation "classical, Steinitz variation"] + +1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O cxd4 * + +[ECO "D27"] +[Opening "QGA"] +[Variation "classical, 6...a6"] + +1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 * + +[ECO "D27"] +[Opening "QGA"] +[Variation "classical, Rubinstein variation"] + +1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. a4 * + +[ECO "D27"] +[Opening "QGA"] +[Variation "classical, Geller variation"] + +1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. e4 * + +[ECO "D28"] +[Opening "QGA"] +[Variation "classical, 7.Qe2"] + +1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. Qe2 * + +[ECO "D28"] +[Opening "QGA"] +[Variation "classical, 7...b5"] + +1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. Qe2 b5 * + +[ECO "D28"] +[Opening "QGA"] +[Variation "classical, Flohr variation"] + +1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. Qe2 b5 8. +Bb3 Nc6 9. Rd1 c4 10. Bc2 Nb4 11. Nc3 Nxc2 12. Qxc2 Bb7 13. d5 Qc7 * + +[ECO "D29"] +[Opening "QGA"] +[Variation "classical, 8...Bb7"] + +1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. Qe2 b5 8. +Bb3 Bb7 * + +[ECO "D29"] +[Opening "QGA"] +[Variation "classical, Smyslov variation"] + +1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. Qe2 b5 8. +Bb3 Bb7 9. Rd1 Nbd7 10. Nc3 Bd6 * + +[ECO "D30"] +[Opening "Queen's gambit declined"] + +1. d4 d5 2. c4 e6 * + +[ECO "D30"] +[Opening "QGD Slav"] + +1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. e3 c6 5. Nbd2 * + +[ECO "D30"] +[Opening "QGD"] +[Variation "Stonewall variation"] + +1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. e3 c6 5. Nbd2 Ne4 6. Bd3 f5 * + +[ECO "D30"] +[Opening "QGD Slav"] + +1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. e3 c6 5. Nbd2 Nbd7 * + +[ECO "D30"] +[Opening "QGD Slav"] +[Variation "Semmering variation"] + +1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. e3 c6 5. Nbd2 Nbd7 6. Bd3 c5 * + +[ECO "D30"] +[Opening "QGD"] +[Variation "Spielmann variation"] + +1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. e3 c6 5. Nbd2 g6 * + +[ECO "D30"] +[Opening "QGD"] + +1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Bg5 * + +[ECO "D30"] +[Opening "QGD"] +[Variation "Capablanca variation"] + +1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Bg5 Nbd7 5. e3 c6 6. Nbd2 * + +[ECO "D30"] +[Opening "QGD"] +[Variation "Vienna variation"] + +1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Bg5 Bb4+ * + +[ECO "D30"] +[Opening "QGD"] +[Variation "Capablanca-Duras variation"] + +1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Bg5 h6 * + +[ECO "D30"] +[Opening "QGD"] +[Variation "Hastings variation"] + +1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Bg5 h6 5. Bxf6 Qxf6 6. Nc3 c6 7. Qb3 * + +[ECO "D31"] +[Opening "QGD"] +[Variation "3.Nc3"] + +1. d4 d5 2. c4 e6 3. Nc3 * + +[ECO "D31"] +[Opening "QGD"] +[Variation "Janowski variation"] + +1. d4 d5 2. c4 e6 3. Nc3 a6 * + +[ECO "D31"] +[Opening "QGD"] +[Variation "Alapin variation"] + +1. d4 d5 2. c4 e6 3. Nc3 b6 * + +[ECO "D31"] +[Opening "QGD"] +[Variation "Charousek (Petrosian) variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Be7 * + +[ECO "D31"] +[Opening "QGD"] +[Variation "semi-Slav"] + +1. d4 d5 2. c4 e6 3. Nc3 c6 * + +[ECO "D31"] +[Opening "QGD"] +[Variation "semi-Slav, Noteboom variation"] + +1. d4 d5 2. c4 e6 3. Nc3 c6 4. Nf3 dxc4 * + +[ECO "D31"] +[Opening "QGD"] +[Variation "semi-Slav, Koomen variation"] + +1. d4 d5 2. c4 e6 3. Nc3 c6 4. Nf3 dxc4 5. a4 Bb4 6. e3 b5 7. Bd2 Qe7 * + +[ECO "D31"] +[Opening "QGD"] +[Variation "semi-Slav, Junge variation"] + +1. d4 d5 2. c4 e6 3. Nc3 c6 4. Nf3 dxc4 5. a4 Bb4 6. e3 b5 7. Bd2 Qb6 * + +[ECO "D31"] +[Opening "QGD"] +[Variation "semi-Slav, Abrahams variation"] + +1. d4 d5 2. c4 e6 3. Nc3 c6 4. Nf3 dxc4 5. a4 Bb4 6. e3 b5 7. Bd2 a5 * + +[ECO "D31"] +[Opening "QGD"] +[Variation "semi-Slav, Marshall gambit"] + +1. d4 d5 2. c4 e6 3. Nc3 c6 4. e4 * + +[ECO "D32"] +[Opening "QGD"] +[Variation "Tarrasch defence"] + +1. d4 d5 2. c4 e6 3. Nc3 c5 * + +[ECO "D32"] +[Opening "QGD"] +[Variation "Tarrasch, von Hennig-Schara gambit"] + +1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 cxd4 * + +[ECO "D32"] +[Opening "QGD"] +[Variation "Tarrasch defence, 4.cd ed"] + +1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 * + +[ECO "D32"] +[Opening "QGD"] +[Variation "Tarrasch defence, Tarrasch gambit"] + +1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. dxc5 d4 6. Na4 b5 * + +[ECO "D32"] +[Opening "QGD"] +[Variation "Tarrasch defence, Marshall gambit"] + +1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. e4 * + +[ECO "D32"] +[Opening "QGD"] +[Variation "Tarrasch defence"] + +1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 * + +[ECO "D33"] +[Opening "QGD"] +[Variation "Tarrasch, Schlechter-Rubinstein system"] + +1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 * + +[ECO "D33"] +[Opening "QGD"] +[Variation "Tarrasch, Folkestone (Swedish) variation"] + +1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 c4 * + +[ECO "D33"] +[Opening "QGD"] +[Variation "Tarrasch, Schlechter-Rubinstein system, Rey Ardid variation"] + +1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 c4 7. e4 * + +[ECO "D33"] +[Opening "QGD"] +[Variation "Tarrasch, Prague variation"] + +1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 * + +[ECO "D33"] +[Opening "QGD"] +[Variation "Tarrasch, Wagner variation"] + +1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7. Bg2 Bg4 * + +[ECO "D34"] +[Opening "QGD"] +[Variation "Tarrasch, Prague variation, 7...Be7"] + +1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7. Bg2 Be7 * + +[ECO "D34"] +[Opening "QGD"] +[Variation "Tarrasch, Prague variation, Normal position"] + +1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7. Bg2 Be7 8. +O-O O-O * + +[ECO "D34"] +[Opening "QGD"] +[Variation "Tarrasch, Reti variation"] + +1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7. Bg2 Be7 8. +O-O O-O 9. dxc5 Bxc5 10. Na4 * + +[ECO "D34"] +[Opening "QGD"] +[Variation "Tarrasch, Prague variation, 9.Bg5"] + +1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7. Bg2 Be7 8. +O-O O-O 9. Bg5 * + +[ECO "D34"] +[Opening "QGD"] +[Variation "Tarrasch, Bogolyubov variation"] + +1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7. Bg2 Be7 8. +O-O O-O 9. Bg5 Be6 10. Rc1 c4 * + +[ECO "D34"] +[Opening "QGD"] +[Variation "Tarrasch, Stoltz variation"] + +1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7. Bg2 Be7 8. +O-O O-O 9. Bg5 Be6 10. Rc1 b6 * + +[ECO "D35"] +[Opening "QGD"] +[Variation "3...Nf6"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 * + +[ECO "D35"] +[Opening "QGD"] +[Variation "Harrwitz attack"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bf4 * + +[ECO "D35"] +[Opening "QGD"] +[Variation "exchange variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cxd5 * + +[ECO "D35"] +[Opening "QGD"] +[Variation "exchange, Saemisch variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cxd5 exd5 5. Nf3 Nbd7 6. Bf4 * + +[ECO "D35"] +[Opening "QGD"] +[Variation "exchange, positional line"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cxd5 exd5 5. Bg5 * + +[ECO "D35"] +[Opening "QGD"] +[Variation "exchange, chameleon variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cxd5 exd5 5. Bg5 Be7 6. e3 O-O 7. Bd3 Nbd7 +8. Qc2 Re8 9. Nge2 Nf8 10. O-O-O * + +[ECO "D35"] +[Opening "QGD"] +[Variation "exchange, positional line, 5...c6"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cxd5 exd5 5. Bg5 c6 * + +[ECO "D36"] +[Opening "QGD"] +[Variation "exchange, positional line, 6.Qc2"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cxd5 exd5 5. Bg5 c6 6. Qc2 * + +[ECO "D37"] +[Opening "QGD"] +[Variation "4.Nf3"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 * + +[ECO "D37"] +[Opening "QGD"] +[Variation "classical variation (5.Bf4)"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 Be7 5. Bf4 * + +[ECO "D38"] +[Opening "QGD"] +[Variation "Ragozin variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 Bb4 * + +[ECO "D39"] +[Opening "QGD"] +[Variation "Ragozin, Vienna variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 Bb4 5. Bg5 dxc4 * + +[ECO "D40"] +[Opening "QGD"] +[Variation "Semi-Tarrasch defence"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c5 * + +[ECO "D40"] +[Opening "QGD"] +[Variation "Semi-Tarrasch, symmetrical variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c5 5. e3 Nc6 6. Bd3 Bd6 7. O-O O-O * + +[ECO "D40"] +[Opening "QGD"] +[Variation "Semi-Tarrasch, Levenfish variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c5 5. e3 Nc6 6. Bd3 Bd6 7. O-O O-O 8. +Qe2 Qe7 9. dxc5 Bxc5 10. e4 * + +[ECO "D40"] +[Opening "QGD"] +[Variation "Semi-Tarrasch defence, Pillsbury variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c5 5. Bg5 * + +[ECO "D41"] +[Opening "QGD"] +[Variation "Semi-Tarrasch, 5.cd"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c5 5. cxd5 * + +[ECO "D41"] +[Opening "QGD"] +[Variation "Semi-Tarrasch, Kmoch variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c5 5. cxd5 Nxd5 6. e4 Nxc3 7. bxc3 cxd4 +8. cxd4 Bb4+ 9. Bd2 Bxd2+ 10. Qxd2 O-O 11. Bb5 * + +[ECO "D41"] +[Opening "QGD"] +[Variation "Semi-Tarrasch, San Sebastian variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c5 5. cxd5 Nxd5 6. e4 Nxc3 7. bxc3 cxd4 +8. cxd4 Bb4+ 9. Bd2 Qa5 * + +[ECO "D41"] +[Opening "QGD"] +[Variation "Semi-Tarrasch with e3"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c5 5. cxd5 Nxd5 6. e3 * + +[ECO "D42"] +[Opening "QGD"] +[Variation "Semi-Tarrasch, 7.Bd3"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c5 5. cxd5 Nxd5 6. e3 Nc6 7. Bd3 * + +[ECO "D43"] +[Opening "QGD semi-Slav"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 * + +[ECO "D43"] +[Opening "QGD semi-Slav"] +[Variation "Hastings variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. Bg5 h6 6. Bxf6 Qxf6 7. Qb3 * + +[ECO "D44"] +[Opening "QGD semi-Slav"] +[Variation "5.Bg5 dc"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. Bg5 dxc4 * + +[ECO "D44"] +[Opening "QGD semi-Slav"] +[Variation "Botvinnik system (anti-Meran)"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. Bg5 dxc4 6. e4 * + +[ECO "D44"] +[Opening "QGD semi-Slav"] +[Variation "Ekstrom variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. Bg5 dxc4 6. e4 b5 7. e5 h6 8. Bh4 +g5 9. exf6 gxh4 10. Ne5 * + +[ECO "D44"] +[Opening "QGD semi-Slav"] +[Variation "anti-Meran gambit"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. Bg5 dxc4 6. e4 b5 7. e5 h6 8. Bh4 +g5 9. Nxg5 * + +[ECO "D44"] +[Opening "QGD semi-Slav"] +[Variation "anti-Meran, Lilienthal variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. Bg5 dxc4 6. e4 b5 7. e5 h6 8. Bh4 +g5 9. Nxg5 hxg5 10. Bxg5 Nbd7 11. g3 * + +[ECO "D44"] +[Opening "QGD semi-Slav"] +[Variation "anti-Meran, Szabo variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. Bg5 dxc4 6. e4 b5 7. e5 h6 8. Bh4 +g5 9. Nxg5 hxg5 10. Bxg5 Nbd7 11. Qf3 * + +[ECO "D44"] +[Opening "QGD semi-Slav"] +[Variation "anti-Meran, Alatortsev system"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. Bg5 dxc4 6. e4 b5 7. e5 h6 8. Bh4 +g5 9. Nxg5 Nd5 * + +[ECO "D45"] +[Opening "QGD semi-Slav"] +[Variation "5.e3"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 * + +[ECO "D45"] +[Opening "QGD semi-Slav"] +[Variation "stonewall defence"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Ne4 6. Bd3 f5 * + +[ECO "D45"] +[Opening "QGD semi-Slav"] +[Variation "accelerated Meran (Alekhine variation)"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 a6 * + +[ECO "D45"] +[Opening "QGD semi-Slav"] +[Variation "5...Nd7"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 * + +[ECO "D45"] +[Opening "QGD semi-Slav"] +[Variation "Stoltz variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Qc2 * + +[ECO "D45"] +[Opening "QGD semi-Slav"] +[Variation "Rubinstein (anti-Meran) system"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Ne5 * + +[ECO "D46"] +[Opening "QGD semi-Slav"] +[Variation "6.Bd3"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3 * + +[ECO "D46"] +[Opening "QGD semi-Slav"] +[Variation "Bogolyubov variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3 Be7 * + +[ECO "D46"] +[Opening "QGD semi-Slav"] +[Variation "Romih variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3 Bb4 * + +[ECO "D46"] +[Opening "QGD semi-Slav"] +[Variation "Chigorin defence"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3 Bd6 * + +[ECO "D47"] +[Opening "QGD semi-Slav"] +[Variation "7.Bc4"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 * + +[ECO "D47"] +[Opening "QGD semi-Slav"] +[Variation "Meran variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 * + +[ECO "D47"] +[Opening "QGD semi-Slav"] +[Variation "neo-Meran (Lundin variation)"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. +Bd3 b4 * + +[ECO "D47"] +[Opening "QGD semi-Slav"] +[Variation "Meran, Wade variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. +Bd3 Bb7 * + +[ECO "D48"] +[Opening "QGD semi-Slav"] +[Variation "Meran, 8...a6"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. +Bd3 a6 * + +[ECO "D48"] +[Opening "QGD semi-Slav"] +[Variation "Meran, Pirc variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. +Bd3 a6 9. e4 b4 * + +[ECO "D48"] +[Opening "QGD semi-Slav"] +[Variation "Meran"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. +Bd3 a6 9. e4 c5 * + +[ECO "D48"] +[Opening "QGD semi-Slav"] +[Variation "Meran, Reynolds' variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. +Bd3 a6 9. e4 c5 10. d5 * + +[ECO "D48"] +[Opening "QGD semi-Slav"] +[Variation "Meran, old main line"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. +Bd3 a6 9. e4 c5 10. e5 * + +[ECO "D49"] +[Opening "QGD semi-Slav"] +[Variation "Meran, Blumenfeld variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. +Bd3 a6 9. e4 c5 10. e5 cxd4 11. Nxb5 * + +[ECO "D49"] +[Opening "QGD semi-Slav"] +[Variation "Meran, Rabinovich variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. +Bd3 a6 9. e4 c5 10. e5 cxd4 11. Nxb5 Ng4 * + +[ECO "D49"] +[Opening "QGD semi-Slav"] +[Variation "Meran, Sozin variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. +Bd3 a6 9. e4 c5 10. e5 cxd4 11. Nxb5 Nxe5 * + +[ECO "D49"] +[Opening "QGD semi-Slav"] +[Variation "Meran, Stahlberg variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. +Bd3 a6 9. e4 c5 10. e5 cxd4 11. Nxb5 Nxe5 12. Nxe5 axb5 13. Qf3 * + +[ECO "D49"] +[Opening "QGD semi-Slav"] +[Variation "Meran, Sozin variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. +Bd3 a6 9. e4 c5 10. e5 cxd4 11. Nxb5 Nxe5 12. Nxe5 axb5 13. O-O * + +[ECO "D49"] +[Opening "QGD semi-Slav"] +[Variation "Meran, Rellstab attack"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. +Bd3 a6 9. e4 c5 10. e5 cxd4 11. Nxb5 Nxe5 12. Nxe5 axb5 13. O-O Qd5 14. Qe2 +Ba6 15. Bg5 * + +[ECO "D50"] +[Opening "QGD"] +[Variation "4.Bg5"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 * + +[ECO "D50"] +[Opening "QGD"] +[Variation "Been-Koomen variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 c5 * + +[ECO "D50"] +[Opening "QGD"] +[Variation "Semi-Tarrasch, Krause variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 c5 5. Nf3 cxd4 6. Nxd4 e5 7. Ndb5 a6 8. +Qa4 * + +[ECO "D50"] +[Opening "QGD"] +[Variation "Semi-Tarrasch, Primitive Pillsbury variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 c5 5. Nf3 cxd4 6. Qxd4 * + +[ECO "D50"] +[Opening "QGD"] +[Variation "Semi-Tarrasch"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 c5 5. cxd5 * + +[ECO "D50"] +[Opening "QGD"] +[Variation "Canal (Venice) variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 c5 5. cxd5 Qb6 * + +[ECO "D51"] +[Opening "QGD"] +[Variation "4.Bg5 Nbd7"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 * + +[ECO "D51"] +[Opening "QGD"] +[Variation "Rochlin variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. Nf3 c6 6. Rc1 Qa5 7. Bd2 * + +[ECO "D51"] +[Opening "QGD"] +[Variation "Alekhine variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. Nf3 c6 6. e4 * + +[ECO "D51"] +[Opening "QGD"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 * + +[ECO "D51"] +[Opening "QGD"] +[Variation "Manhattan variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 Bb4 * + +[ECO "D51"] +[Opening "QGD"] +[Variation "5...c6"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 c6 * + +[ECO "D51"] +[Opening "QGD"] +[Variation "Capablanca anti-Cambridge Springs variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 c6 6. a3 * + +[ECO "D52"] +[Opening "QGD"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 c6 6. Nf3 * + +[ECO "D52"] +[Opening "QGD"] +[Variation "Cambridge Springs defence"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 c6 6. Nf3 Qa5 * + +[ECO "D52"] +[Opening "QGD"] +[Variation "Cambridge Springs defence, Bogoljubow variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 c6 6. Nf3 Qa5 7. Nd2 Bb4 8. +Qc2 * + +[ECO "D52"] +[Opening "QGD"] +[Variation "Cambridge Springs defence, Argentine variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 c6 6. Nf3 Qa5 7. Nd2 Bb4 8. +Qc2 O-O 9. Bh4 * + +[ECO "D52"] +[Opening "QGD"] +[Variation "Cambridge Springs defence, Rubinstein variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 c6 6. Nf3 Qa5 7. Nd2 dxc4 * + +[ECO "D52"] +[Opening "QGD"] +[Variation "Cambridge Springs defence, Capablanca variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 c6 6. Nf3 Qa5 7. Bxf6 * + +[ECO "D52"] +[Opening "QGD"] +[Variation "Cambridge Springs defence, 7.cd"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 c6 6. Nf3 Qa5 7. cxd5 * + +[ECO "D52"] +[Opening "QGD"] +[Variation "Cambridge Springs defence, Yugoslav variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 c6 6. Nf3 Qa5 7. cxd5 Nxd5 * + +[ECO "D53"] +[Opening "QGD"] +[Variation "4.Bg5 Be7"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 * + +[ECO "D53"] +[Opening "QGD"] +[Variation "Lasker variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 Ne4 * + +[ECO "D53"] +[Opening "QGD"] +[Variation "4.Bg5 Be7, 5.e3 O-O"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O * + +[ECO "D54"] +[Opening "QGD"] +[Variation "Anti-neo-orthodox variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Rc1 * + +[ECO "D55"] +[Opening "QGD"] +[Variation "6.Nf3"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 * + +[ECO "D55"] +[Opening "QGD"] +[Variation "Pillsbury attack"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 b6 7. Bd3 Bb7 8. +cxd5 exd5 9. Ne5 * + +[ECO "D55"] +[Opening "QGD"] +[Variation "Neo-orthodox variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 h6 * + +[ECO "D55"] +[Opening "QGD"] +[Variation "Neo-orthodox variation, 7.Bxf6"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 h6 7. Bxf6 * + +[ECO "D55"] +[Opening "QGD"] +[Variation "Petrosian variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 h6 7. Bxf6 Bxf6 8. +Rc1 c6 9. Bd3 Nd7 10. O-O dxc4 11. Bxc4 * + +[ECO "D55"] +[Opening "QGD"] +[Variation "Neo-orthodox variation, 7.Bh4"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 h6 7. Bh4 * + +[ECO "D56"] +[Opening "QGD"] +[Variation "Lasker defence"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 h6 7. Bh4 Ne4 * + +[ECO "D56"] +[Opening "QGD"] +[Variation "Lasker defence, Teichmann variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 h6 7. Bh4 Ne4 8. +Bxe7 Qxe7 9. Qc2 * + +[ECO "D56"] +[Opening "QGD"] +[Variation "Lasker defence, Russian variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 h6 7. Bh4 Ne4 8. +Bxe7 Qxe7 9. Qc2 Nf6 10. Bd3 dxc4 11. Bxc4 c5 12. O-O Nc6 13. Rfd1 Bd7 * + +[ECO "D57"] +[Opening "QGD"] +[Variation "Lasker defence, main line"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 h6 7. Bh4 Ne4 8. +Bxe7 Qxe7 9. cxd5 Nxc3 10. bxc3 * + +[ECO "D57"] +[Opening "QGD"] +[Variation "Lasker defence, Bernstein variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 h6 7. Bh4 Ne4 8. +Bxe7 Qxe7 9. cxd5 Nxc3 10. bxc3 exd5 11. Qb3 Qd6 * + +[ECO "D58"] +[Opening "QGD"] +[Variation "Tartakower (Makagonov-Bondarevsky) system"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 h6 7. Bh4 b6 * + +[ECO "D59"] +[Opening "QGD"] +[Variation "Tartakower (Makagonov-Bondarevsky) system, 8.cd Nxd5"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 h6 7. Bh4 b6 8. +cxd5 Nxd5 * + +[ECO "D59"] +[Opening "QGD"] +[Variation "Tartakower variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 h6 7. Bh4 b6 8. +cxd5 Nxd5 9. Bxe7 Qxe7 10. Nxd5 exd5 11. Rc1 Be6 * + +[ECO "D60"] +[Opening "QGD"] +[Variation "Orthodox defence"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 * + +[ECO "D60"] +[Opening "QGD"] +[Variation "Orthodox defence, Botvinnik variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Bd3 * + +[ECO "D60"] +[Opening "QGD"] +[Variation "Orthodox defence, Rauzer variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Qb3 * + +[ECO "D61"] +[Opening "QGD"] +[Variation "Orthodox defence, Rubinstein variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Qc2 * + +[ECO "D62"] +[Opening "QGD"] +[Variation "Orthodox defence, 7.Qc2 c5, 8.cd (Rubinstein)"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Qc2 c5 8. +cxd5 * + +[ECO "D63"] +[Opening "QGD"] +[Variation "Orthodox defence, 7.Rc1"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 * + +[ECO "D63"] +[Opening "QGD"] +[Variation "Orthodox defence, Pillsbury attack"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 b6 8. +cxd5 exd5 9. Bd3 * + +[ECO "D63"] +[Opening "QGD"] +[Variation "Orthodox defence, Capablanca variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 b6 8. +cxd5 exd5 9. Bb5 * + +[ECO "D63"] +[Opening "QGD"] +[Variation "Orthodox defence, Swiss (Henneberger) variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 a6 * + +[ECO "D63"] +[Opening "QGD"] +[Variation "Orthodox defence, Swiss, Karlsbad variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 a6 8. +cxd5 * + +[ECO "D63"] +[Opening "QGD"] +[Variation "Orthodox defence"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 * + +[ECO "D64"] +[Opening "QGD"] +[Variation "Orthodox defence, Rubinstein attack (with Rc1)"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. +Qc2 * + +[ECO "D64"] +[Opening "QGD"] +[Variation "Orthodox defence, Rubinstein attack, Wolf variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. +Qc2 Ne4 * + +[ECO "D64"] +[Opening "QGD"] +[Variation "Orthodox defence, Rubinstein attack, Karlsbad variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. +Qc2 a6 * + +[ECO "D64"] +[Opening "QGD"] +[Variation "Orthodox defence, Rubinstein attack, Gruenfeld variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. +Qc2 a6 9. a3 * + +[ECO "D65"] +[Opening "QGD"] +[Variation "Orthodox defence, Rubinstein attack, main line"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. +Qc2 a6 9. cxd5 * + +[ECO "D66"] +[Opening "QGD"] +[Variation "Orthodox defence, Bd3 line"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. +Bd3 * + +[ECO "D66"] +[Opening "QGD"] +[Variation "Orthodox defence, Bd3 line, fianchetto variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. +Bd3 dxc4 9. Bxc4 b5 * + +[ECO "D67"] +[Opening "QGD"] +[Variation "Orthodox defence, Bd3 line, Capablanca freeing manoevre"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. +Bd3 dxc4 9. Bxc4 Nd5 * + +[ECO "D67"] +[Opening "QGD"] +[Variation "Orthodox defence, Bd3 line, Janowski variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. +Bd3 dxc4 9. Bxc4 Nd5 10. h4 * + +[ECO "D67"] +[Opening "QGD"] +[Variation "Orthodox defence, Bd3 line"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. +Bd3 dxc4 9. Bxc4 Nd5 10. Bxe7 Qxe7 * + +[ECO "D67"] +[Opening "QGD"] +[Variation "Orthodox defence, Bd3 line, Alekhine variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. +Bd3 dxc4 9. Bxc4 Nd5 10. Bxe7 Qxe7 11. Ne4 * + +[ECO "D67"] +[Opening "QGD"] +[Variation "Orthodox defence, Bd3 line, 11.O-O"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. +Bd3 dxc4 9. Bxc4 Nd5 10. Bxe7 Qxe7 11. O-O * + +[ECO "D68"] +[Opening "QGD"] +[Variation "Orthodox defence, classical variation"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. +Bd3 dxc4 9. Bxc4 Nd5 10. Bxe7 Qxe7 11. O-O Nxc3 12. Rxc3 e5 * + +[ECO "D68"] +[Opening "QGD"] +[Variation "Orthodox defence, classical, 13.d1b1 (Maroczy)"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. +Bd3 dxc4 9. Bxc4 Nd5 10. Bxe7 Qxe7 11. O-O Nxc3 12. Rxc3 e5 13. Qb1 * + +[ECO "D68"] +[Opening "QGD"] +[Variation "Orthodox defence, classical, 13.d1c2 (Vidmar)"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. +Bd3 dxc4 9. Bxc4 Nd5 10. Bxe7 Qxe7 11. O-O Nxc3 12. Rxc3 e5 13. Qc2 * + +[ECO "D69"] +[Opening "QGD"] +[Variation "Orthodox defence, classical, 13.de"] + +1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. +Bd3 dxc4 9. Bxc4 Nd5 10. Bxe7 Qxe7 11. O-O Nxc3 12. Rxc3 e5 13. dxe5 Nxe5 +14. Nxe5 Qxe5 * + +[ECO "D70"] +[Opening "Neo-Gruenfeld defence"] + +1. d4 Nf6 2. c4 g6 3. f3 d5 * + +[ECO "D70"] +[Opening "Neo-Gruenfeld (Kemeri) defence"] + +1. d4 Nf6 2. c4 g6 3. g3 d5 * + +[ECO "D71"] +[Opening "Neo-Gruenfeld, 5.cd"] + +1. d4 Nf6 2. c4 g6 3. g3 d5 4. Bg2 Bg7 5. cxd5 Nxd5 * + +[ECO "D72"] +[Opening "Neo-Gruenfeld, 5.cd, main line"] + +1. d4 Nf6 2. c4 g6 3. g3 d5 4. Bg2 Bg7 5. cxd5 Nxd5 6. e4 Nb6 7. Ne2 * + +[ECO "D73"] +[Opening "Neo-Gruenfeld, 5.Nf3"] + +1. d4 Nf6 2. c4 g6 3. g3 d5 4. Bg2 Bg7 5. Nf3 * + +[ECO "D74"] +[Opening "Neo-Gruenfeld, 6.cd Nxd5, 7.O-O"] + +1. d4 Nf6 2. c4 g6 3. g3 d5 4. Bg2 Bg7 5. Nf3 O-O 6. cxd5 Nxd5 7. O-O * + +[ECO "D75"] +[Opening "Neo-Gruenfeld, 6.cd Nxd5, 7.O-O c5, 8.Nc3"] + +1. d4 Nf6 2. c4 g6 3. g3 d5 4. Bg2 Bg7 5. Nf3 O-O 6. cxd5 Nxd5 7. O-O c5 8. +Nc3 * + +[ECO "D75"] +[Opening "Neo-Gruenfeld, 6.cd Nxd5, 7.O-O c5, 8.dc"] + +1. d4 Nf6 2. c4 g6 3. g3 d5 4. Bg2 Bg7 5. Nf3 O-O 6. cxd5 Nxd5 7. O-O c5 8. +dxc5 * + +[ECO "D76"] +[Opening "Neo-Gruenfeld, 6.cd Nxd5, 7.O-O Nb6"] + +1. d4 Nf6 2. c4 g6 3. g3 d5 4. Bg2 Bg7 5. Nf3 O-O 6. cxd5 Nxd5 7. O-O Nb6 * + +[ECO "D77"] +[Opening "Neo-Gruenfeld, 6.O-O"] + +1. d4 Nf6 2. c4 g6 3. g3 d5 4. Bg2 Bg7 5. Nf3 O-O 6. O-O * + +[ECO "D78"] +[Opening "Neo-Gruenfeld, 6.O-O c6"] + +1. d4 Nf6 2. c4 g6 3. g3 d5 4. Bg2 Bg7 5. Nf3 O-O 6. O-O c6 * + +[ECO "D79"] +[Opening "Neo-Gruenfeld, 6.O-O, main line"] + +1. d4 Nf6 2. c4 g6 3. g3 d5 4. Bg2 Bg7 5. Nf3 O-O 6. O-O c6 7. cxd5 cxd5 * + +[ECO "D80"] +[Opening "Gruenfeld defence"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 * + +[ECO "D80"] +[Opening "Gruenfeld"] +[Variation "Spike gambit"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. g4 * + +[ECO "D80"] +[Opening "Gruenfeld"] +[Variation "Stockholm variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bg5 * + +[ECO "D80"] +[Opening "Gruenfeld"] +[Variation "Lundin variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bg5 Ne4 5. Nxe4 dxe4 6. Qd2 c5 * + +[ECO "D81"] +[Opening "Gruenfeld"] +[Variation "Russian variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Qb3 * + +[ECO "D82"] +[Opening "Gruenfeld"] +[Variation "4.Bf4"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 * + +[ECO "D83"] +[Opening "Gruenfeld"] +[Variation "Gruenfeld gambit"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O * + +[ECO "D83"] +[Opening "Gruenfeld"] +[Variation "Gruenfeld gambit, Capablanca variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O 6. Rc1 * + +[ECO "D83"] +[Opening "Gruenfeld"] +[Variation "Gruenfeld gambit, Botvinnik variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O 6. Rc1 c5 7. dxc5 Be6 * + +[ECO "D84"] +[Opening "Gruenfeld"] +[Variation "Gruenfeld gambit accepted"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O 6. cxd5 Nxd5 7. Nxd5 Qxd5 +8. Bxc7 * + +[ECO "D85"] +[Opening "Gruenfeld"] +[Variation "exchange variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 * + +[ECO "D85"] +[Opening "Gruenfeld"] +[Variation "modern exchange variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Nf3 * + +[ECO "D86"] +[Opening "Gruenfeld"] +[Variation "exchange, classical variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 * + +[ECO "D86"] +[Opening "Gruenfeld"] +[Variation "exchange, Larsen variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 O-O +8. Ne2 Qd7 9. O-O b6 * + +[ECO "D86"] +[Opening "Gruenfeld"] +[Variation "exchange, Simagin's lesser variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 O-O +8. Ne2 b6 * + +[ECO "D86"] +[Opening "Gruenfeld"] +[Variation "exchange, Simagin's improved variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 O-O +8. Ne2 Nc6 * + +[ECO "D87"] +[Opening "Gruenfeld"] +[Variation "exchange, Spassky variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 O-O +8. Ne2 c5 * + +[ECO "D87"] +[Opening "Gruenfeld"] +[Variation "exchange, Seville variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 O-O +8. Ne2 c5 9. O-O Nc6 10. Be3 Bg4 11. f3 Na5 12. Bxf7+ * + +[ECO "D88"] +[Opening "Gruenfeld"] +[Variation "Spassky variation, main line, 10...cd, 11.cd"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 O-O +8. Ne2 c5 9. O-O Nc6 10. Be3 cxd4 11. cxd4 * + +[ECO "D89"] +[Opening "Gruenfeld"] +[Variation "Spassky variation, main line, 13.Bd3"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 O-O +8. Ne2 c5 9. O-O Nc6 10. Be3 cxd4 11. cxd4 Bg4 12. f3 Na5 13. Bd3 Be6 * + +[ECO "D89"] +[Opening "Gruenfeld"] +[Variation "exchange, Sokolsky variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 O-O +8. Ne2 c5 9. O-O Nc6 10. Be3 cxd4 11. cxd4 Bg4 12. f3 Na5 13. Bd3 Be6 14. +d5 * + +[ECO "D90"] +[Opening "Gruenfeld"] +[Variation "Three knights variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 * + +[ECO "D90"] +[Opening "Gruenfeld"] +[Variation "Schlechter variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 c6 * + +[ECO "D90"] +[Opening "Gruenfeld"] +[Variation "Three knights variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 * + +[ECO "D90"] +[Opening "Gruenfeld"] +[Variation "Flohr variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qa4+ * + +[ECO "D91"] +[Opening "Gruenfeld"] +[Variation "5.Bg5"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bg5 * + +[ECO "D92"] +[Opening "Gruenfeld"] +[Variation "5.Bf4"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bf4 * + +[ECO "D93"] +[Opening "Gruenfeld with Bf4 e3"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bf4 O-O 6. e3 * + +[ECO "D94"] +[Opening "Gruenfeld"] +[Variation "5.e3"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. e3 * + +[ECO "D94"] +[Opening "Gruenfeld"] +[Variation "Makogonov variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. e3 O-O 6. b4 * + +[ECO "D94"] +[Opening "Gruenfeld"] +[Variation "Opovcensky variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. e3 O-O 6. Bd2 * + +[ECO "D94"] +[Opening "Gruenfeld with e3 Bd3"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. e3 O-O 6. Bd3 * + +[ECO "D94"] +[Opening "Gruenfeld"] +[Variation "Smyslov defence"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. e3 O-O 6. Bd3 c6 7. O-O Bg4 * + +[ECO "D94"] +[Opening "Gruenfeld"] +[Variation "Flohr defence"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. e3 O-O 6. Bd3 c6 7. O-O Bf5 * + +[ECO "D95"] +[Opening "Gruenfeld with e3 & Qb3"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. e3 O-O 6. Qb3 * + +[ECO "D95"] +[Opening "Gruenfeld"] +[Variation "Botvinnik variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. e3 O-O 6. Qb3 e6 * + +[ECO "D95"] +[Opening "Gruenfeld"] +[Variation "Pachman variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. e3 O-O 6. Qb3 dxc4 7. Bxc4 Nbd7 +8. Ng5 * + +[ECO "D96"] +[Opening "Gruenfeld"] +[Variation "Russian variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 * + +[ECO "D97"] +[Opening "Gruenfeld"] +[Variation "Russian variation with e4"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 * + +[ECO "D97"] +[Opening "Gruenfeld"] +[Variation "Russian, Alekhine (Hungarian) variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 a6 * + +[ECO "D97"] +[Opening "Gruenfeld"] +[Variation "Russian, Szabo (Boleslavsky) variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 c6 * + +[ECO "D97"] +[Opening "Gruenfeld"] +[Variation "Russian, Levenfish variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 b6 * + +[ECO "D97"] +[Opening "Gruenfeld"] +[Variation "Russian, Byrne (Simagin) variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 Nc6 * + +[ECO "D97"] +[Opening "Gruenfeld"] +[Variation "Russian, Prins variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 Na6 * + +[ECO "D98"] +[Opening "Gruenfeld"] +[Variation "Russian, Smyslov variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 Bg4 * + +[ECO "D98"] +[Opening "Gruenfeld"] +[Variation "Russian, Keres variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 Bg4 +8. Be3 Nfd7 9. Be2 Nb6 10. Qd3 Nc6 11. O-O-O * + +[ECO "D99"] +[Opening "Gruenfeld defence"] +[Variation "Smyslov, main line"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 Bg4 +8. Be3 Nfd7 9. Qb3 * + +[ECO "D99"] +[Opening "Gruenfeld defence"] +[Variation "Smyslov, Yugoslav variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 Bg4 +8. Be3 Nfd7 9. Qb3 c5 * + +[ECO "E00"] +[Opening "Queen's pawn game"] + +1. d4 Nf6 2. c4 e6 * + +[ECO "E00"] +[Opening "Neo-Indian (Seirawan) attack"] + +1. d4 Nf6 2. c4 e6 3. Bg5 * + +[ECO "E00"] +[Opening "Catalan opening"] + +1. d4 Nf6 2. c4 e6 3. g3 * + +[ECO "E01"] +[Opening "Catalan"] +[Variation "closed"] + +1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 * + +[ECO "E02"] +[Opening "Catalan"] +[Variation "open, 5.Qa4"] + +1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Qa4+ * + +[ECO "E03"] +[Opening "Catalan"] +[Variation "open, Alekhine variation"] + +1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Qa4+ Nbd7 6. Qxc4 a6 7. Qc2 * + +[ECO "E03"] +[Opening "Catalan"] +[Variation "open, 5.Qa4 Nbd7, 6.Qxc4"] + +1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Qa4+ Nbd7 6. Qxc4 * + +[ECO "E04"] +[Opening "Catalan"] +[Variation "open, 5.Nf3"] + +1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Nf3 * + +[ECO "E05"] +[Opening "Catalan"] +[Variation "open, classical line"] + +1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Nf3 Be7 * + +[ECO "E06"] +[Opening "Catalan"] +[Variation "closed, 5.Nf3"] + +1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 * + +[ECO "E07"] +[Opening "Catalan"] +[Variation "closed, 6...Nbd7"] + +1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 * + +[ECO "E07"] +[Opening "Catalan"] +[Variation "closed, Botvinnik variation"] + +1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Nc3 c6 8. +Qd3 * + +[ECO "E08"] +[Opening "Catalan"] +[Variation "closed, 7.Qc2"] + +1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 * + +[ECO "E08"] +[Opening "Catalan"] +[Variation "closed, Zagoryansky variation"] + +1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 c6 8. +Rd1 b6 9. a4 * + +[ECO "E08"] +[Opening "Catalan"] +[Variation "closed, Qc2 & b3"] + +1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 c6 8. +b3 * + +[ECO "E08"] +[Opening "Catalan"] +[Variation "closed, Spassky gambit"] + +1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 c6 8. +b3 b6 9. Rd1 Bb7 10. Nc3 b5 * + +[ECO "E09"] +[Opening "Catalan"] +[Variation "closed, main line"] + +1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 c6 8. +Nbd2 * + +[ECO "E09"] +[Opening "Catalan"] +[Variation "closed, Sokolsky variation"] + +1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 c6 8. +Nbd2 b6 9. b3 a5 10. Bb2 Ba6 * + +[ECO "E10"] +[Opening "Queen's pawn game"] + +1. d4 Nf6 2. c4 e6 3. Nf3 * + +[ECO "E10"] +[Opening "Blumenfeld counter-gambit"] + +1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 b5 * + +[ECO "E10"] +[Opening "Blumenfeld counter-gambit accepted"] + +1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 b5 5. dxe6 fxe6 6. cxb5 d5 * + +[ECO "E10"] +[Opening "Blumenfeld counter-gambit, Dus-Chotimursky variation"] + +1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 b5 5. Bg5 * + +[ECO "E10"] +[Opening "Blumenfeld counter-gambit, Spielmann variation"] + +1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 b5 5. Bg5 exd5 6. cxd5 h6 * + +[ECO "E10"] +[Opening "Dzindzikhashvili defence"] + +1. d4 Nf6 2. c4 e6 3. Nf3 a6 * + +[ECO "E10"] +[Opening "Doery defence"] + +1. d4 Nf6 2. c4 e6 3. Nf3 Ne4 * + +[ECO "E11"] +[Opening "Bogo-Indian defence"] + +1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ * + +[ECO "E11"] +[Opening "Bogo-Indian defence, Gruenfeld variation"] + +1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Nbd2 * + +[ECO "E11"] +[Opening "Bogo-Indian defence, Nimzovich variation"] + +1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Bd2 Qe7 * + +[ECO "E11"] +[Opening "Bogo-Indian defence, Monticelli trap"] + +1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Bd2 Bxd2+ 5. Qxd2 b6 6. g3 Bb7 7. Bg2 O-O +8. Nc3 Ne4 9. Qc2 Nxc3 10. Ng5 * + +[ECO "E12"] +[Opening "Queen's Indian defence"] + +1. d4 Nf6 2. c4 e6 3. Nf3 b6 * + +[ECO "E12"] +[Opening "Queen's Indian"] +[Variation "Miles variation"] + +1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Bf4 * + +[ECO "E12"] +[Opening "Queen's Indian"] +[Variation "Petrosian system"] + +1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 * + +[ECO "E12"] +[Opening "Queen's Indian"] +[Variation "4.Nc3"] + +1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 * + +[ECO "E12"] +[Opening "Queen's Indian"] +[Variation "4.Nc3, Botvinnik variation"] + +1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb7 5. Bg5 h6 6. Bh4 g5 7. Bg3 Nh5 * + +[ECO "E13"] +[Opening "Queen's Indian"] +[Variation "4.Nc3, main line"] + +1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb7 5. Bg5 h6 6. Bh4 Bb4 * + +[ECO "E14"] +[Opening "Queen's Indian"] +[Variation "4.e3"] + +1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. e3 * + +[ECO "E14"] +[Opening "Queen's Indian"] +[Variation "Averbakh variation"] + +1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. e3 Bb7 5. Bd3 c5 6. O-O Be7 7. b3 O-O 8. +Bb2 cxd4 9. Nxd4 * + +[ECO "E15"] +[Opening "Queen's Indian"] +[Variation "4.g3"] + +1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 * + +[ECO "E15"] +[Opening "Queen's Indian"] +[Variation "Nimzovich variation (exaggerated fianchetto)"] + +1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Ba6 * + +[ECO "E15"] +[Opening "Queen's Indian"] +[Variation "4.g3 Bb7"] + +1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 * + +[ECO "E15"] +[Opening "Queen's Indian"] +[Variation "Rubinstein variation"] + +1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 c5 6. d5 exd5 7. Nh4 * + +[ECO "E15"] +[Opening "Queen's Indian"] +[Variation "Buerger variation"] + +1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 c5 6. d5 exd5 7. Ng5 * + +[ECO "E16"] +[Opening "Queen's Indian"] +[Variation "Capablanca variation"] + +1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ * + +[ECO "E16"] +[Opening "Queen's Indian"] +[Variation "Yates variation"] + +1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 a5 * + +[ECO "E16"] +[Opening "Queen's Indian"] +[Variation "Riumin variation"] + +1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Be7 * + +[ECO "E17"] +[Opening "Queen's Indian"] +[Variation "5.Bg2 Be7"] + +1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 * + +[ECO "E17"] +[Opening "Queen's Indian"] +[Variation "anti-Queen's Indian system"] + +1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. Nc3 * + +[ECO "E17"] +[Opening "Queen's Indian"] +[Variation "Opovcensky variation"] + +1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. Nc3 Ne4 7. Bd2 * + +[ECO "E17"] +[Opening "Queen's Indian"] +[Variation "old main line, 6.O-O"] + +1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O * + +[ECO "E17"] +[Opening "Queen's Indian"] +[Variation "Euwe variation"] + +1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. b3 * + +[ECO "E18"] +[Opening "Queen's Indian"] +[Variation "old main line, 7.Nc3"] + +1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. Nc3 * + +[ECO "E19"] +[Opening "Queen's Indian"] +[Variation "old main line, 9.Qxc3"] + +1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. Nc3 Ne4 8. +Qc2 Nxc3 9. Qxc3 * + +[ECO "E20"] +[Opening "Nimzo-Indian defence"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 * + +[ECO "E20"] +[Opening "Nimzo-Indian"] +[Variation "Kmoch variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. f3 * + +[ECO "E20"] +[Opening "Nimzo-Indian"] +[Variation "Mikenas attack"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qd3 * + +[ECO "E20"] +[Opening "Nimzo-Indian"] +[Variation "Romanishin-Kasparov (Steiner) system"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. g3 * + +[ECO "E21"] +[Opening "Nimzo-Indian"] +[Variation "three knights variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 * + +[ECO "E21"] +[Opening "Nimzo-Indian"] +[Variation "three knights, Korchnoi variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 c5 5. d5 * + +[ECO "E21"] +[Opening "Nimzo-Indian"] +[Variation "three knights, Euwe variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 c5 5. d5 Ne4 * + +[ECO "E22"] +[Opening "Nimzo-Indian"] +[Variation "Spielmann variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qb3 * + +[ECO "E23"] +[Opening "Nimzo-Indian"] +[Variation "Spielmann, 4...c5, 5.dc Nc6"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qb3 c5 5. dxc5 Nc6 * + +[ECO "E23"] +[Opening "Nimzo-Indian"] +[Variation "Spielmann, Karlsbad variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qb3 c5 5. dxc5 Nc6 6. Nf3 Ne4 7. Bd2 Nxd2 +* + +[ECO "E23"] +[Opening "Nimzo-Indian"] +[Variation "Spielmann, San Remo variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qb3 c5 5. dxc5 Nc6 6. Nf3 Ne4 7. Bd2 Nxc5 +* + +[ECO "E23"] +[Opening "Nimzo-Indian"] +[Variation "Spielmann, Staahlberg variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qb3 c5 5. dxc5 Nc6 6. Nf3 Ne4 7. Bd2 Nxc5 +8. Qc2 f5 9. g3 * + +[ECO "E24"] +[Opening "Nimzo-Indian"] +[Variation "Saemisch variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 * + +[ECO "E24"] +[Opening "Nimzo-Indian"] +[Variation "Saemisch, Botvinnik variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 c5 6. f3 d5 7. e3 O-O 8. +cxd5 Nxd5 * + +[ECO "E25"] +[Opening "Nimzo-Indian"] +[Variation "Saemisch variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 c5 6. f3 d5 7. cxd5 * + +[ECO "E25"] +[Opening "Nimzo-Indian"] +[Variation "Saemisch, Keres variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 c5 6. f3 d5 7. cxd5 Nxd5 +8. dxc5 * + +[ECO "E25"] +[Opening "Nimzo-Indian"] +[Variation "Saemisch, Romanovsky variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 c5 6. f3 d5 7. cxd5 Nxd5 +8. dxc5 f5 * + +[ECO "E26"] +[Opening "Nimzo-Indian"] +[Variation "Saemisch variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 c5 6. e3 * + +[ECO "E26"] +[Opening "Nimzo-Indian"] +[Variation "Saemisch, O'Kelly variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 c5 6. e3 b6 * + +[ECO "E27"] +[Opening "Nimzo-Indian"] +[Variation "Saemisch variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 O-O * + +[ECO "E28"] +[Opening "Nimzo-Indian"] +[Variation "Saemisch variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 O-O 6. e3 * + +[ECO "E29"] +[Opening "Nimzo-Indian"] +[Variation "Saemisch, main line"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 O-O 6. e3 c5 7. Bd3 Nc6 * + +[ECO "E29"] +[Opening "Nimzo-Indian"] +[Variation "Saemisch, Capablanca variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 O-O 6. e3 c5 7. Bd3 Nc6 +8. Ne2 b6 9. e4 Ne8 * + +[ECO "E30"] +[Opening "Nimzo-Indian"] +[Variation "Leningrad variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Bg5 * + +[ECO "E30"] +[Opening "Nimzo-Indian"] +[Variation "Leningrad, ...b5 gambit"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Bg5 h6 5. Bh4 c5 6. d5 b5 * + +[ECO "E31"] +[Opening "Nimzo-Indian"] +[Variation "Leningrad, main line"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Bg5 h6 5. Bh4 c5 6. d5 d6 * + +[ECO "E32"] +[Opening "Nimzo-Indian"] +[Variation "classical variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 * + +[ECO "E32"] +[Opening "Nimzo-Indian"] +[Variation "classical, Adorjan gambit"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b5 * + +[ECO "E33"] +[Opening "Nimzo-Indian"] +[Variation "classical, 4...Nc6"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 Nc6 * + +[ECO "E33"] +[Opening "Nimzo-Indian"] +[Variation "classical, Milner-Barry (Zurich) variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 Nc6 5. Nf3 d6 * + +[ECO "E34"] +[Opening "Nimzo-Indian"] +[Variation "classical, Noa variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 * + +[ECO "E35"] +[Opening "Nimzo-Indian"] +[Variation "classical, Noa variation, 5.cd ed"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. cxd5 exd5 * + +[ECO "E36"] +[Opening "Nimzo-Indian"] +[Variation "classical, Noa variation, 5.a3"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. a3 * + +[ECO "E36"] +[Opening "Nimzo-Indian"] +[Variation "classical, Botvinnik variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. a3 Bxc3+ 6. Qxc3 Nc6 * + +[ECO "E36"] +[Opening "Nimzo-Indian"] +[Variation "classical, Noa variation, main line"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. a3 Bxc3+ 6. Qxc3 Ne4 * + +[ECO "E37"] +[Opening "Nimzo-Indian"] +[Variation "classical, Noa variation, main line, 7.Qc2"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. a3 Bxc3+ 6. Qxc3 Ne4 7. Qc2 * + +[ECO "E37"] +[Opening "Nimzo-Indian"] +[Variation "classical, San Remo variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. a3 Bxc3+ 6. Qxc3 Ne4 7. Qc2 Nc6 +8. e3 e5 * + +[ECO "E38"] +[Opening "Nimzo-Indian"] +[Variation "classical, 4...c5"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5 * + +[ECO "E39"] +[Opening "Nimzo-Indian"] +[Variation "classical, Pirc variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5 5. dxc5 O-O * + +[ECO "E40"] +[Opening "Nimzo-Indian"] +[Variation "4.e3"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 * + +[ECO "E40"] +[Opening "Nimzo-Indian"] +[Variation "4.e3, Taimanov variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 Nc6 * + +[ECO "E41"] +[Opening "Nimzo-Indian"] +[Variation "4.e3 c5"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 * + +[ECO "E41"] +[Opening "Nimzo-Indian"] +[Variation "e3, Huebner variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Bd3 Nc6 6. Nf3 Bxc3+ 7. bxc3 d6 * + +[ECO "E42"] +[Opening "Nimzo-Indian"] +[Variation "4.e3 c5, 5.Ne2 (Rubinstein)"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Ne2 * + +[ECO "E43"] +[Opening "Nimzo-Indian"] +[Variation "Fischer variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 * + +[ECO "E44"] +[Opening "Nimzo-Indian"] +[Variation "Fischer variation, 5.Ne2"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Ne2 * + +[ECO "E45"] +[Opening "Nimzo-Indian"] +[Variation "4.e3, Bronstein (Byrne) variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Ne2 Ba6 * + +[ECO "E46"] +[Opening "Nimzo-Indian"] +[Variation "4.e3 O-O"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O * + +[ECO "E46"] +[Opening "Nimzo-Indian"] +[Variation "Reshevsky variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Ne2 * + +[ECO "E46"] +[Opening "Nimzo-Indian"] +[Variation "Simagin variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Ne2 d5 6. a3 Bd6 * + +[ECO "E47"] +[Opening "Nimzo-Indian"] +[Variation "4.e3 O-O, 5.Bd3"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 * + +[ECO "E48"] +[Opening "Nimzo-Indian"] +[Variation "4.e3 O-O, 5.Bd3 d5"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 * + +[ECO "E49"] +[Opening "Nimzo-Indian"] +[Variation "4.e3, Botvinnik system"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. a3 Bxc3+ 7. bxc3 * + +[ECO "E50"] +[Opening "Nimzo-Indian"] +[Variation "4.e3 e8g8, 5.Nf3, without ...d5"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 * + +[ECO "E51"] +[Opening "Nimzo-Indian"] +[Variation "4.e3 e8g8, 5.Nf3 d7d5"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 * + +[ECO "E51"] +[Opening "Nimzo-Indian"] +[Variation "4.e3, Ragozin variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 Nc6 7. O-O dxc4 * + +[ECO "E52"] +[Opening "Nimzo-Indian"] +[Variation "4.e3, main line with ...b6"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 b6 * + +[ECO "E53"] +[Opening "Nimzo-Indian"] +[Variation "4.e3, main line with ...c5"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 c5 * + +[ECO "E53"] +[Opening "Nimzo-Indian"] +[Variation "4.e3, Keres variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 c5 7. O-O b6 * + +[ECO "E53"] +[Opening "Nimzo-Indian"] +[Variation "4.e3, Gligoric system with 7...Nbd7"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 c5 7. O-O Nbd7 * + +[ECO "E54"] +[Opening "Nimzo-Indian"] +[Variation "4.e3, Gligoric system with 7...dc"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 c5 7. O-O dxc4 8. +Bxc4 * + +[ECO "E54"] +[Opening "Nimzo-Indian"] +[Variation "4.e3, Gligoric system, Smyslov variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 c5 7. O-O dxc4 8. +Bxc4 Qe7 * + +[ECO "E55"] +[Opening "Nimzo-Indian"] +[Variation "4.e3, Gligoric system, Bronstein variation"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 c5 7. O-O dxc4 8. +Bxc4 Nbd7 * + +[ECO "E56"] +[Opening "Nimzo-Indian"] +[Variation "4.e3, main line with 7...Nc6"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 c5 7. O-O Nc6 * + +[ECO "E57"] +[Opening "Nimzo-Indian"] +[Variation "4.e3, main line with 8...dc and 9...cd"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 c5 7. O-O Nc6 8. +a3 dxc4 9. Bxc4 cxd4 * + +[ECO "E58"] +[Opening "Nimzo-Indian"] +[Variation "4.e3, main line with 8...Bxc3"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 c5 7. O-O Nc6 8. +a3 Bxc3 9. bxc3 * + +[ECO "E59"] +[Opening "Nimzo-Indian"] +[Variation "4.e3, main line"] + +1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 c5 7. O-O Nc6 8. +a3 Bxc3 9. bxc3 dxc4 10. Bxc4 * + +[ECO "E60"] +[Opening "King's Indian defence"] + +1. d4 Nf6 2. c4 g6 * + +[ECO "E60"] +[Opening "King's Indian, 3.Nf3"] + +1. d4 Nf6 2. c4 g6 3. Nf3 * + +[ECO "E60"] +[Opening "Queen's pawn"] +[Variation "Mengarini attack"] + +1. d4 Nf6 2. c4 g6 3. Qc2 * + +[ECO "E60"] +[Opening "King's Indian"] +[Variation "Anti-Gruenfeld"] + +1. d4 Nf6 2. c4 g6 3. d5 * + +[ECO "E60"] +[Opening "King's Indian"] +[Variation "Danube gambit"] + +1. d4 Nf6 2. c4 g6 3. d5 b5 * + +[ECO "E60"] +[Opening "King's Indian"] +[Variation "3.g3"] + +1. d4 Nf6 2. c4 g6 3. g3 * + +[ECO "E60"] +[Opening "King's Indian"] +[Variation "3.g3, counterthrust variation"] + +1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 d5 * + +[ECO "E61"] +[Opening "King's Indian defence, 3.Nc3"] + +1. d4 Nf6 2. c4 g6 3. Nc3 * + +[ECO "E61"] +[Opening "King's Indian"] +[Variation "Smyslov system"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. Bg5 * + +[ECO "E62"] +[Opening "King's Indian"] +[Variation "fianchetto variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 * + +[ECO "E62"] +[Opening "King's Indian"] +[Variation "fianchetto, Larsen system"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 c6 7. O-O Bf5 * + +[ECO "E62"] +[Opening "King's Indian"] +[Variation "fianchetto, Kavalek (Bronstein) variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 c6 7. O-O Qa5 * + +[ECO "E62"] +[Opening "King's Indian"] +[Variation "fianchetto with ...Nc6"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 Nc6 * + +[ECO "E62"] +[Opening "King's Indian"] +[Variation "fianchetto, Uhlmann (Szabo) variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 Nc6 7. O-O e5 * + +[ECO "E62"] +[Opening "King's Indian"] +[Variation "fianchetto, lesser Simagin (Spassky) variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 Nc6 7. O-O Bf5 * + +[ECO "E62"] +[Opening "King's Indian"] +[Variation "fianchetto, Simagin variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 Nc6 7. O-O Bg4 * + +[ECO "E63"] +[Opening "King's Indian"] +[Variation "fianchetto, Panno variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 Nc6 7. O-O a6 * + +[ECO "E64"] +[Opening "King's Indian"] +[Variation "fianchetto, Yugoslav system"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 c5 * + +[ECO "E65"] +[Opening "King's Indian"] +[Variation "fianchetto, Yugoslav, 7.O-O"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 c5 7. O-O * + +[ECO "E66"] +[Opening "King's Indian"] +[Variation "fianchetto, Yugoslav Panno"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 c5 7. O-O Nc6 8. +d5 * + +[ECO "E67"] +[Opening "King's Indian"] +[Variation "fianchetto with ...Nd7"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 Nbd7 * + +[ECO "E67"] +[Opening "King's Indian"] +[Variation "fianchetto, classical variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 Nbd7 7. O-O e5 * + +[ECO "E68"] +[Opening "King's Indian"] +[Variation "fianchetto, classical variation, 8.e4"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 Nbd7 7. O-O e5 8. +e4 * + +[ECO "E69"] +[Opening "King's Indian"] +[Variation "fianchetto, classical main line"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 Nbd7 7. O-O e5 8. +e4 c6 9. h3 * + +[ECO "E70"] +[Opening "King's Indian"] +[Variation "4.e4"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 * + +[ECO "E70"] +[Opening "King's Indian"] +[Variation "Kramer system"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nge2 * + +[ECO "E70"] +[Opening "King's Indian"] +[Variation "accelerated Averbakh system"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Bg5 * + +[ECO "E71"] +[Opening "King's Indian"] +[Variation "Makagonov system (5.h3)"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. h3 * + +[ECO "E72"] +[Opening "King's Indian with e4 & g3"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. g3 * + +[ECO "E72"] +[Opening "King's Indian"] +[Variation "Pomar system"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. g3 O-O 6. Bg2 e5 7. Nge2 * + +[ECO "E73"] +[Opening "King's Indian"] +[Variation "5.Be2"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 * + +[ECO "E73"] +[Opening "King's Indian"] +[Variation "Semi-Averbakh system"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Be3 * + +[ECO "E73"] +[Opening "King's Indian"] +[Variation "Averbakh system"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Bg5 * + +[ECO "E74"] +[Opening "King's Indian"] +[Variation "Averbakh, 6...c5"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Bg5 c5 * + +[ECO "E75"] +[Opening "King's Indian"] +[Variation "Averbakh, main line"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Bg5 c5 7. d5 e6 * + +[ECO "E76"] +[Opening "King's Indian"] +[Variation "Four pawns attack"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 * + +[ECO "E76"] +[Opening "King's Indian"] +[Variation "Four pawns attack, dynamic line"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 O-O 6. Nf3 c5 7. d5 * + +[ECO "E77"] +[Opening "King's Indian"] +[Variation "Four pawns attack, 6.Be2"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 O-O 6. Be2 * + +[ECO "E77"] +[Opening "King's Indian"] +[Variation "Six pawns attack"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 O-O 6. Be2 c5 7. d5 e6 8. dxe6 +fxe6 9. g4 Nc6 10. h4 * + +[ECO "E77"] +[Opening "King's Indian"] +[Variation "Four pawns attack"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 O-O 6. Be2 c5 7. d5 e6 8. Nf3 +* + +[ECO "E77"] +[Opening "King's Indian"] +[Variation "Four pawns attack, Florentine gambit"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 O-O 6. Be2 c5 7. d5 e6 8. Nf3 +exd5 9. e5 * + +[ECO "E78"] +[Opening "King's Indian"] +[Variation "Four pawns attack, with Be2 and Nf3"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 O-O 6. Be2 c5 7. Nf3 * + +[ECO "E79"] +[Opening "King's Indian"] +[Variation "Four pawns attack, main line"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 O-O 6. Be2 c5 7. Nf3 cxd4 8. +Nxd4 Nc6 9. Be3 * + +[ECO "E80"] +[Opening "King's Indian"] +[Variation "Saemisch variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 * + +[ECO "E81"] +[Opening "King's Indian"] +[Variation "Saemisch, 5...O-O"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O * + +[ECO "E81"] +[Opening "King's Indian"] +[Variation "Saemisch, Byrne variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 c6 7. Bd3 a6 * + +[ECO "E82"] +[Opening "King's Indian"] +[Variation "Saemisch, double fianchetto variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 b6 * + +[ECO "E83"] +[Opening "King's Indian"] +[Variation "Saemisch, 6...Nc6"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 Nc6 * + +[ECO "E83"] +[Opening "King's Indian"] +[Variation "Saemisch, Ruban variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 Nc6 7. Nge2 Rb8 * + +[ECO "E83"] +[Opening "King's Indian"] +[Variation "Saemisch, Panno formation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 Nc6 7. Nge2 a6 * + +[ECO "E84"] +[Opening "King's Indian"] +[Variation "Saemisch, Panno main line"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 Nc6 7. Nge2 a6 8. +Qd2 Rb8 * + +[ECO "E85"] +[Opening "King's Indian"] +[Variation "Saemisch, orthodox variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 e5 * + +[ECO "E86"] +[Opening "King's Indian"] +[Variation "Saemisch, orthodox, 7.Nge2 c6"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 e5 7. Nge2 c6 * + +[ECO "E87"] +[Opening "King's Indian"] +[Variation "Saemisch, orthodox, 7.d5"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 e5 7. d5 * + +[ECO "E87"] +[Opening "King's Indian"] +[Variation "Saemisch, orthodox, Bronstein variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 e5 7. d5 Nh5 8. Qd2 +Qh4+ 9. g3 Nxg3 10. Qf2 Nxf1 11. Qxh4 Nxe3 12. Ke2 Nxc4 * + +[ECO "E88"] +[Opening "King's Indian"] +[Variation "Saemisch, orthodox, 7.d5 c6"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 e5 7. d5 c6 * + +[ECO "E89"] +[Opening "King's Indian"] +[Variation "Saemisch, orthodox main line"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 e5 7. d5 c6 8. Nge2 +cxd5 * + +[ECO "E90"] +[Opening "King's Indian"] +[Variation "5.Nf3"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 * + +[ECO "E90"] +[Opening "King's Indian"] +[Variation "Larsen variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be3 * + +[ECO "E90"] +[Opening "King's Indian"] +[Variation "Zinnowitz variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Bg5 * + +[ECO "E91"] +[Opening "King's Indian"] +[Variation "6.Be2"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 * + +[ECO "E91"] +[Opening "King's Indian"] +[Variation "Kazakh variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 Na6 * + +[ECO "E92"] +[Opening "King's Indian"] +[Variation "classical variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 * + +[ECO "E92"] +[Opening "King's Indian"] +[Variation "Andersson variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. dxe5 * + +[ECO "E92"] +[Opening "King's Indian"] +[Variation "Gligoric-Taimanov system"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. Be3 * + +[ECO "E92"] +[Opening "King's Indian"] +[Variation "Petrosian system"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. d5 * + +[ECO "E92"] +[Opening "King's Indian"] +[Variation "Petrosian system, Stein variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. d5 a5 * + +[ECO "E93"] +[Opening "King's Indian"] +[Variation "Petrosian system, main line"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. d5 Nbd7 * + +[ECO "E93"] +[Opening "King's Indian"] +[Variation "Petrosian system, Keres variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. d5 Nbd7 8. +Bg5 h6 9. Bh4 g5 10. Bg3 Nh5 11. h4 * + +[ECO "E94"] +[Opening "King's Indian"] +[Variation "orthodox variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O * + +[ECO "E94"] +[Opening "King's Indian"] +[Variation "orthodox, Donner variation"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O c6 * + +[ECO "E94"] +[Opening "King's Indian"] +[Variation "orthodox, 7...Nbd7"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nbd7 * + +[ECO "E95"] +[Opening "King's Indian"] +[Variation "orthodox, 7...Nbd7, 8.Re1"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nbd7 8. +Re1 * + +[ECO "E96"] +[Opening "King's Indian"] +[Variation "orthodox, 7...Nbd7, main line"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nbd7 8. +Re1 c6 9. Bf1 a5 * + +[ECO "E97"] +[Opening "King's Indian"] +[Variation "orthodox, Aronin-Taimanov variation (Yugoslav attack / Mar del Plata variation)"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 * + +[ECO "E97"] +[Opening "King's Indian"] +[Variation "orthodox, Aronin-Taimanov, bayonet attack"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8. +d5 Ne7 9. b4 * + +[ECO "E98"] +[Opening "King's Indian"] +[Variation "orthodox, Aronin-Taimanov, 9.Ne1"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8. +d5 Ne7 9. Ne1 * + +[ECO "E99"] +[Opening "King's Indian"] +[Variation "orthodox, Aronin-Taimanov, main line"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8. +d5 Ne7 9. Ne1 Nd7 10. f3 f5 * + +[ECO "E99"] +[Opening "King's Indian"] +[Variation "orthodox, Aronin-Taimanov, Benko attack"] + +1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8. +d5 Ne7 9. Ne1 Nd7 10. f3 f5 11. g4 * + diff --git a/book/twic-9g.bin b/book/twic-9g.bin # file too large to diff: book/twic-9g.bin diff --git a/chessIO.cabal b/chessIO.cabal --- a/chessIO.cabal +++ b/chessIO.cabal @@ -4,10 +4,10 @@ -- -- see: https://github.com/sol/hpack -- --- hash: 3fcf399df92e8a53a4f22341832c3dc5a45222618873d4edd74b61fca3a35598 +-- hash: 58ed029b69d3e53603aa5e6f7cdac0fb58c1971595e47e3aba37cb0cfc6ac07f name: chessIO -version: 0.6.1.1 +version: 0.7.0.0 synopsis: Basic chess library description: A simple and fast library for generating legal chess moves. Also includes a module for communication with external processes that speak the UCI (Universal Chess Interface) protocol, a PGN parser/pretty printer, and Polyglot opening book support. On top of that, provides a console frontend program (cboard) that can be used to interactively play against UCI engines, and a terminal program (cbookview) to explore commonly played chess openings. category: Game @@ -15,13 +15,14 @@ bug-reports: https://github.com/mlang/chessIO/issues author: Mario Lang maintainer: mlang@blind.guru -copyright: 2020 Mario Lang +copyright: 2021 Mario Lang license: BSD3 license-file: LICENSE build-type: Simple extra-source-files: README.md CHANGELOG.md + book/eco.pgn book/twic-9g.bin source-repository head @@ -31,6 +32,7 @@ library exposed-modules: Game.Chess + Game.Chess.ECO Game.Chess.PGN Game.Chess.Polyglot Game.Chess.SAN @@ -38,6 +40,7 @@ Game.Chess.UCI other-modules: Game.Chess.Internal + Game.Chess.Internal.ECO Game.Chess.Internal.QuadBitboard Game.Chess.Internal.Square Game.Chess.Polyglot.Hash @@ -49,6 +52,7 @@ BinaryLiterals BlockArguments DeriveGeneric + DeriveLift FlexibleContexts FlexibleInstances GeneralizedNewtypeDeriving @@ -72,17 +76,25 @@ , binary , bytestring , containers + , deepseq , extra , file-embed + , hashable + , lens , megaparsec >=9.0 + , mono-traversable , o-clock , prettyprinter , process , random , stm + , template-haskell , text + , th-lift-instances , unordered-containers , vector + , vector-binary-instances + , vector-instances default-language: Haskell2010 executable cboard @@ -96,6 +108,7 @@ BinaryLiterals BlockArguments DeriveGeneric + DeriveLift FlexibleContexts FlexibleInstances GeneralizedNewtypeDeriving @@ -120,19 +133,27 @@ , bytestring , chessIO , containers + , deepseq , extra , file-embed + , hashable , haskeline + , lens , megaparsec >=9.0 + , mono-traversable , mtl , o-clock , prettyprinter , process , random , stm + , template-haskell , text + , th-lift-instances , unordered-containers , vector + , vector-binary-instances + , vector-instances default-language: Haskell2010 executable cbookview @@ -146,6 +167,7 @@ BinaryLiterals BlockArguments DeriveGeneric + DeriveLift FlexibleContexts FlexibleInstances GeneralizedNewtypeDeriving @@ -171,21 +193,27 @@ , bytestring , chessIO , containers + , deepseq , extra , file-embed , filepath + , hashable + , lens , megaparsec >=9.0 - , microlens - , microlens-th + , mono-traversable , o-clock , prettyprinter , process , random , rosezipper , stm + , template-haskell , text + , th-lift-instances , unordered-containers , vector + , vector-binary-instances + , vector-instances , vty default-language: Haskell2010 @@ -200,6 +228,7 @@ BinaryLiterals BlockArguments DeriveGeneric + DeriveLift FlexibleContexts FlexibleInstances GeneralizedNewtypeDeriving @@ -224,19 +253,27 @@ , bytestring , chessIO , containers + , deepseq , extra , file-embed + , hashable + , lens , megaparsec >=9.0 + , mono-traversable , o-clock , optparse-applicative , prettyprinter , process , random , stm + , template-haskell , text + , th-lift-instances , time , unordered-containers , vector + , vector-binary-instances + , vector-instances default-language: Haskell2010 test-suite perft @@ -251,6 +288,7 @@ BinaryLiterals BlockArguments DeriveGeneric + DeriveLift FlexibleContexts FlexibleInstances GeneralizedNewtypeDeriving @@ -275,18 +313,26 @@ , bytestring , chessIO , containers + , deepseq , directory , extra , file-embed + , hashable + , lens , megaparsec >=9.0 + , mono-traversable , o-clock , parallel , prettyprinter , process , random , stm + , template-haskell , text + , th-lift-instances , time , unordered-containers , vector + , vector-binary-instances + , vector-instances default-language: Haskell2010 diff --git a/src/Game/Chess.hs b/src/Game/Chess.hs --- a/src/Game/Chess.hs +++ b/src/Game/Chess.hs @@ -1,7 +1,7 @@ {-| Module : Game.Chess Description : Basic data types and functions related to the game of chess -Copyright : (c) Mario Lang, 2020 +Copyright : (c) Mario Lang, 2021 License : BSD3 Maintainer : mlang@blind.guru Stability : experimental @@ -18,6 +18,7 @@ The following modules implement more specific functionality: +- "Game.Chess.ECO": Parse the Encyclopedia of Chess Openings and lookup positions - "Game.Chess.Polyglot": Polyglot opening book format - "Game.Chess.SAN": Parse and print Standard Algebraic Notation. - "Game.Chess.PGN": Parse and format Portable Game Notation files. @@ -27,7 +28,18 @@ module Game.Chess ( -- * Chess positions Color(..), opponent -, IsSquare(toIndex, toRF), Sq(..), isLight, isDark +, Square(A1, A2, A3, A4, A5, A6, A7, A8, + B1, B2, B3, B4, B5, B6, B7, B8, + C1, C2, C3, C4, C5, C6, C7, C8, + D1, D2, D3, D4, D5, D6, D7, D8, + E1, E2, E3, E4, E5, E6, E7, E8, + F1, F2, F3, F4, F5, F6, F7, F8, + G1, G2, G3, G4, G5, G6, G7, G8, + H1, H2, H3, H4, H5, H6, H7, H8) +, rank, Rank(Rank1, Rank2, Rank3, Rank4, Rank5, Rank6, Rank7, Rank8) +, file, File(FileA, FileB, FileC, FileD, FileE, FileF, FileG, FileH) +, rankFile, isLight, isDark +, rankChar, fileChar, toCoord , PieceType(..), Castle(..) , Position, startpos, color, moveNumber, halfMoveClock, pieceAt, inCheck , castlingRights, canCastleKingside, canCastleQueenside @@ -35,7 +47,7 @@ -- ** Converting from/to Forsyth-Edwards-Notation , fromFEN, toFEN -- * Chess moves -, Ply(..), plySource, plyTarget, plyPromotion +, Ply, plySource, plyTarget, plyPromotion -- ** Convertion , fromUCI, toUCI, fromPolyglot, toPolyglot -- ** Move generation @@ -44,5 +56,5 @@ , doPly, unsafeDoPly ) where -import Game.Chess.Internal.Square -import Game.Chess.Internal +import Game.Chess.Internal +import Game.Chess.Internal.Square diff --git a/src/Game/Chess/ECO.hs b/src/Game/Chess/ECO.hs new file mode 100644 --- /dev/null +++ b/src/Game/Chess/ECO.hs @@ -0,0 +1,34 @@ +{-# LANGUAGE TemplateHaskell #-} +{-| +Module : Game.Chess.ECO +Description : Encyclopedia of Chess Openings +Copyright : (c) Mario Lang, 2021 +License : BSD3 +Maintainer : mlang@blind.guru +Stability : experimental + +Types and functions to name chess positions according to the opening used. + +Two commonly used file formats for opening classification are supported. +-} +module Game.Chess.ECO ( + -- * Data types + ECO, Opening(..) +, defaultECO + -- * Query +, lookup + -- * Conversion +, fromList, toList + -- * Parsing eco.pgn files +, fromPGN, readECOPGNFile + -- * Parsing scid .eco files +, readSCIDECOFile, scid + -- * Template Haskell +, embedECO, ecoPgn, scidEco +) where + +import Game.Chess.Internal.ECO +import Prelude hiding (lookup) + +defaultECO :: ECO +defaultECO = $$(embedECO ecoPgn "book/eco.pgn") diff --git a/src/Game/Chess/Internal.hs b/src/Game/Chess/Internal.hs --- a/src/Game/Chess/Internal.hs +++ b/src/Game/Chess/Internal.hs @@ -16,57 +16,76 @@ -} module Game.Chess.Internal where -import Data.Bits - ( Bits((.&.), testBit, unsafeShiftR, unsafeShiftL, xor, (.|.), bit, complement), - FiniteBits(countLeadingZeros, countTrailingZeros) ) -import Data.Char ( ord, chr ) -import Data.Ix ( Ix(inRange) ) -import Data.List (nub, sortOn) -import Data.Maybe ( fromJust, isJust, listToMaybe ) -import Data.Ord (Down(..)) -import Data.String ( IsString(..) ) -import Data.Vector.Unboxed (Vector, (!)) -import qualified Data.Vector.Unboxed as Vector -import Data.Word ( Word16, Word64 ) -import Foreign.Storable -import Game.Chess.Internal.Square (IsSquare(toIndex, toRF), Sq(..), toCoord) -import Game.Chess.Internal.QuadBitboard (QuadBitboard) +import Control.DeepSeq +import Control.Lens (view) +import Control.Lens.Iso (from) +import Data.Binary +import Data.Bits (Bits (bit, complement, testBit, unsafeShiftL, unsafeShiftR, xor, (.&.), (.|.)), + FiniteBits (countLeadingZeros, countTrailingZeros)) +import Data.Char (chr, ord) +import Data.Hashable +import Data.Ix (Ix (inRange)) +import Data.List (nub, sortOn) +import Data.Maybe (fromJust, isJust, + listToMaybe) +import Data.Ord (Down (..)) +import Data.String (IsString (..)) +import qualified Data.Vector.Generic as G +import qualified Data.Vector.Generic.Mutable as M +import Data.Vector.Unboxed (MVector, Unbox, Vector, (!)) +import qualified Data.Vector.Unboxed as Vector +import Data.Word (Word16, Word64) +import Foreign.Storable +import GHC.Generics (Generic) +import GHC.Stack (HasCallStack) +import Game.Chess.Internal.QuadBitboard (QuadBitboard) import qualified Game.Chess.Internal.QuadBitboard as QBB -import Text.Read (readMaybe) +import Game.Chess.Internal.Square +import Language.Haskell.TH.Syntax (Lift) +import Text.Read (readMaybe) capturing :: Position -> Ply -> Maybe PieceType capturing pos@Position{flags} (plyTarget -> to) - | (flags .&. epMask) `testBit` to = Just Pawn + | (flags .&. epMask) `testBit` unSquare to = Just Pawn | otherwise = snd <$> pieceAt pos to isCapture :: Position -> Ply -> Bool -isCapture pos = isJust . capturing pos +isCapture Position{qbb, flags} = + testBit (QBB.occupied qbb .|. (flags .&. epMask)) . unSquare . plyTarget -- | The starting position as given by the FEN string -- "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1". startpos :: Position -startpos = fromJust $ - fromFEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1" +startpos = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1" +instance IsString Position where fromString = fromJust . fromFEN + data PieceType = Pawn | Knight | Bishop | Rook | Queen | King deriving (Eq, Ix, Ord, Show) -data Color = Black | White deriving (Eq, Ix, Ord, Show) +data Color = Black | White deriving (Eq, Generic, Ix, Ord, Lift, Show) -pieceAt :: IsSquare sq => Position -> sq -> Maybe (Color, PieceType) -pieceAt Position{qbb} (toIndex -> sq) = case qbb QBB.! sq of - QBB.WhitePawn -> Just (White, Pawn) +instance Binary Color +instance NFData Color + +instance Hashable Color where + hashWithSalt s Black = s `hashWithSalt` (0 :: Int) + hashWithSalt s White = s `hashWithSalt` (1 :: Int) + +pieceAt :: Position -> Square -> Maybe (Color, PieceType) +pieceAt Position{qbb} sq = case qbb QBB.! sq of + QBB.WhitePawn -> Just (White, Pawn) QBB.WhiteKnight -> Just (White, Knight) QBB.WhiteBishop -> Just (White, Bishop) - QBB.WhiteRook -> Just (White, Rook) - QBB.WhiteQueen -> Just (White, Queen) - QBB.WhiteKing -> Just (White, King) - QBB.BlackPawn -> Just (Black, Pawn) + QBB.WhiteRook -> Just (White, Rook) + QBB.WhiteQueen -> Just (White, Queen) + QBB.WhiteKing -> Just (White, King) + QBB.BlackPawn -> Just (Black, Pawn) QBB.BlackKnight -> Just (Black, Knight) QBB.BlackBishop -> Just (Black, Bishop) - QBB.BlackRook -> Just (Black, Rook) - QBB.BlackQueen -> Just (Black, Queen) - QBB.BlackKing -> Just (Black, King) - _ -> Nothing + QBB.BlackRook -> Just (Black, Rook) + QBB.BlackQueen -> Just (Black, Queen) + QBB.BlackKing -> Just (Black, King) + _ -> Nothing opponent :: Color -> Color opponent White = Black @@ -75,15 +94,18 @@ data Piece = Piece !Color !PieceType deriving (Eq, Show) data Position = Position { - qbb :: {-# UNPACK #-} !QuadBitboard -, color :: !Color + qbb :: {-# UNPACK #-} !QuadBitboard +, color :: !Color -- ^ active color -, flags :: {-# UNPACK #-} !Word64 +, flags :: {-# UNPACK #-} !Word64 , halfMoveClock :: {-# UNPACK #-} !Int -, moveNumber :: {-# UNPACK #-} !Int +, moveNumber :: {-# UNPACK #-} !Int -- ^ number of the full move -} +} deriving (Generic, Lift) +instance Binary Position +instance NFData Position + -- Article 9.2 states that a position is considered -- identical to another if the same player is on move, the same types of -- pieces of the same colors occupy the same squares, and the same moves @@ -92,6 +114,10 @@ instance Eq Position where a == b = qbb a == qbb b && color a == color b && flags a == flags b +instance Hashable Position where + hashWithSalt s Position{qbb, color, flags} = + s `hashWithSalt` qbb `hashWithSalt` color `hashWithSalt` flags + repetitions :: [Position] -> Maybe (Int, Position) repetitions p = listToMaybe . sortOn (Down . fst) . fmap f $ nub p where f x = (count x p, x) @@ -118,7 +144,7 @@ parts = words fen readColor "w" = Just White readColor "b" = Just Black - readColor _ = Nothing + readColor _ = Nothing readFlags cst ep = (.|.) <$> readCst cst <*> readEP ep where readCst "-" = Just 0 @@ -127,8 +153,8 @@ go ('Q':xs) = (crwQs .|.) <$> go xs go ('k':xs) = (crbKs .|.) <$> go xs go ('q':xs) = (crbQs .|.) <$> go xs - go [] = Just 0 - go _ = Nothing + go [] = Just 0 + go _ = Nothing readEP "-" = Just 0 readEP [f,r] | inRange ('a','h') f && (r == '3' || r == '6') @@ -151,7 +177,7 @@ showCst x | str == "" = "-" | otherwise = str - where + where str = snd . wks . wqs . bks . bqs $ (x, "") wks (v, xs) | v `testMask` crwKs = (v, 'K':xs) | otherwise = (v, xs) @@ -162,7 +188,7 @@ bqs (v, xs) | v `testMask` crbQs = (v, 'q':xs) | otherwise = (v, xs) showEP 0 = "-" - showEP x = toCoord (bitScanForward x) + showEP x = toCoord . Sq . bitScanForward $ x occupiedBy :: Color -> QuadBitboard -> Word64 occupiedBy White = QBB.white @@ -180,13 +206,46 @@ bitScanForward = countTrailingZeros bitScanReverse = (63 -) . countLeadingZeros -newtype Ply = Ply Word16 deriving (Eq, Storable) +newtype Ply = Ply Word16 deriving (Binary, Eq, Hashable, Lift, Storable) instance Show Ply where - show = toUCI + show (unpack -> (from, to, promo)) = "move " <> show from <> " " <> show to <> p where + p = case promo of + Just piece -> " `promoteTo` " <> show piece + Nothing -> "" -move :: (IsSquare from, IsSquare to) => from -> to -> Ply -move (toIndex -> from) (toIndex -> to) = +newtype instance MVector s Ply = MV_Ply (MVector s Word16) +newtype instance Vector Ply = V_Ply (Vector Word16) + +instance M.MVector MVector Ply where + basicLength (MV_Ply v) = M.basicLength v + basicUnsafeSlice i n (MV_Ply v) = MV_Ply $ M.basicUnsafeSlice i n v + basicOverlaps (MV_Ply v1) (MV_Ply v2) = M.basicOverlaps v1 v2 + basicUnsafeNew n = MV_Ply <$> M.basicUnsafeNew n + basicInitialize (MV_Ply v) = M.basicInitialize v + basicUnsafeReplicate n (Ply pl) = MV_Ply <$> M.basicUnsafeReplicate n pl + basicUnsafeRead (MV_Ply v) i = Ply <$> M.basicUnsafeRead v i + basicUnsafeWrite (MV_Ply v) i (Ply pl) = M.basicUnsafeWrite v i pl + basicClear (MV_Ply v) = M.basicClear v + basicSet (MV_Ply v) (Ply pl) = M.basicSet v pl + basicUnsafeCopy (MV_Ply v1) (MV_Ply v2) = M.basicUnsafeCopy v1 v2 + basicUnsafeMove (MV_Ply v1) (MV_Ply v2) = M.basicUnsafeMove v1 v2 + basicUnsafeGrow (MV_Ply v) n = MV_Ply <$> M.basicUnsafeGrow v n + +instance G.Vector Vector Ply where + {-# INLINE basicUnsafeIndexM #-} + basicUnsafeFreeze (MV_Ply v) = V_Ply <$> G.basicUnsafeFreeze v + basicUnsafeThaw (V_Ply v) = MV_Ply <$> G.basicUnsafeThaw v + basicLength (V_Ply v) = G.basicLength v + basicUnsafeSlice i n (V_Ply v) = V_Ply $ G.basicUnsafeSlice i n v + basicUnsafeIndexM (V_Ply v) i = Ply <$> G.basicUnsafeIndexM v i + basicUnsafeCopy (MV_Ply mv) (V_Ply v) = G.basicUnsafeCopy mv v + elemseq _ pl z = G.elemseq (undefined :: Vector a) pl z + +instance Unbox Ply + +move :: Square -> Square -> Ply +move (Sq from) (Sq to) = Ply $ fromIntegral to .|. fromIntegral from `unsafeShiftL` 6 promoteTo :: Ply -> PieceType -> Ply @@ -197,9 +256,9 @@ set Queen = x .&. 0xfff .|. 0x4000 set _ = x -plySource, plyTarget :: Ply -> Int -plySource (Ply x) = fromIntegral ((x `unsafeShiftR` 6) .&. 0b111111) -plyTarget (Ply x) = fromIntegral (x .&. 0b111111) +plySource, plyTarget :: Ply -> Square +plySource (Ply x) = Sq $ fromIntegral ((x `unsafeShiftR` 6) .&. 0b111111) +plyTarget (Ply x) = Sq $ fromIntegral (x .&. 0b111111) plyPromotion :: Ply -> Maybe PieceType plyPromotion (Ply x) = case x `unsafeShiftR` 12 of @@ -209,9 +268,9 @@ 4 -> Just Queen _ -> Nothing -unpack :: Ply -> (Int, Int, Maybe PieceType) -unpack (Ply x) = ( fromIntegral ((x `unsafeShiftR` 6) .&. 0b111111) - , fromIntegral (x .&. 0b111111) +unpack :: Ply -> (Square, Square, Maybe PieceType) +unpack (Ply x) = ( Sq $ fromIntegral ((x `unsafeShiftR` 6) .&. 0b111111) + , Sq $ fromIntegral (x .&. 0b111111) , piece) where !piece = case x `unsafeShiftR` 12 of @@ -223,76 +282,76 @@ fromPolyglot :: Position -> Ply -> Ply fromPolyglot pos pl@(unpack -> (from, to, _)) = case color pos of - White | from == toIndex E1 + White | from == E1 , canCastleKingside pos - , to == toIndex H1 + , to == H1 -> wKscm - | from == toIndex E1 + | from == E1 , canCastleQueenside pos - , to == toIndex A1 + , to == A1 -> wQscm - Black | from == toIndex E8 + Black | from == E8 , canCastleKingside pos - , to == toIndex H8 + , to == H8 -> bKscm - | from == toIndex E8 + | from == E8 , canCastleQueenside pos - , to == toIndex A8 + , to == A8 -> bQscm _ -> pl toPolyglot :: Position -> Ply -> Ply toPolyglot pos pl@(unpack -> (from, to, _)) = case color pos of - White | from == toIndex E1 + White | from == E1 , canCastleKingside pos - , to == toIndex G1 + , to == G1 -> from `move` H1 - | from == toIndex E1 + | from == E1 , canCastleQueenside pos - , to == toIndex C1 + , to == C1 -> from `move` A1 - Black | from == toIndex E8 + Black | from == E8 , canCastleKingside pos - , to == toIndex G8 + , to == G8 -> from `move` H8 - | from == toIndex E8 + | from == E8 , canCastleQueenside pos - , to == toIndex C8 + , to == C8 -> from `move` A8 _ -> pl -- | Parse a move in the format used by the Universal Chess Interface protocol. fromUCI :: Position -> String -> Maybe Ply -fromUCI pos (fmap (splitAt 2) . splitAt 2 -> (from, (to, promo))) +fromUCI pos (fmap (splitAt 2) . splitAt 2 -> (src, (dst, promo))) | null promo - = move <$> readCoord from <*> readCoord to >>= relativeTo pos + = move <$> readCoord src <*> readCoord dst >>= relativeTo pos | otherwise - = (\f t p -> move f t `promoteTo` p) <$> readCoord from - <*> readCoord to + = (\f t p -> move f t `promoteTo` p) <$> readCoord src + <*> readCoord dst <*> readPromo promo >>= relativeTo pos where readCoord [f,r] | inRange ('a','h') f && inRange ('1','8') r - = Just $ (ord r - ord '1') * 8 + (ord f - ord 'a') + = Just . view (from rankFile) $ (mkRank $ ord r - ord '1', mkFile $ ord f - ord 'a') readCoord _ = Nothing readPromo "q" = Just Queen readPromo "r" = Just Rook readPromo "b" = Just Bishop readPromo "n" = Just Knight - readPromo _ = Nothing + readPromo _ = Nothing -- | Convert a move to the format used by the Universal Chess Interface protocol. toUCI :: Ply -> String toUCI (unpack -> (from, to, promo)) = coord from <> coord to <> p where - coord x = let (r,f) = toRF x in - chr (f + ord 'a') : [chr (r + ord '1')] + coord x = let (r,f) = view rankFile x in + chr (unFile f + ord 'a') : [chr (unRank r + ord '1')] p = case promo of - Just Queen -> "q" - Just Rook -> "r" + Just Queen -> "q" + Just Rook -> "r" Just Bishop -> "b" Just Knight -> "n" - _ -> "" + _ -> "" -- | Validate that a certain move is legal in the given position. relativeTo :: Position -> Ply -> Maybe Ply @@ -321,7 +380,7 @@ -- -- This function checks if the move is actually legal and throws and error -- if it isn't. See 'unsafeDoPly' for a version that omits the legality check. -doPly :: Position -> Ply -> Position +doPly :: HasCallStack => Position -> Ply -> Position doPly p m | m `elem` legalPlies p = unsafeDoPly p m | otherwise = error "Game.Chess.doPly: Illegal move" @@ -343,7 +402,7 @@ pos' = unsafeDoPly' pos m isPawnPush p m = case pieceAt p (plySource m) of Just (_, Pawn) -> True - _ -> False + _ -> False unsafeDoPly' :: Position -> Ply -> Position unsafeDoPly' pos@Position{qbb, flags} m@(unpack -> (from, to, promo)) @@ -367,34 +426,34 @@ = case color pos of White -> case piece of Queen -> pos { qbb = QBB.whitePromotion qbb from to QBB.WhiteQueen - , flags = flags `clearMask` (epMask .|. bit to) + , flags = flags `clearMask` (epMask .|. bit (unSquare to)) } Rook -> pos { qbb = QBB.whitePromotion qbb from to QBB.WhiteRook - , flags = flags `clearMask` (epMask .|. bit to) + , flags = flags `clearMask` (epMask .|. bit (unSquare to)) } Bishop -> pos { qbb = QBB.whitePromotion qbb from to QBB.WhiteBishop - , flags = flags `clearMask` (epMask .|. bit to) + , flags = flags `clearMask` (epMask .|. bit (unSquare to)) } Knight -> pos { qbb = QBB.whitePromotion qbb from to QBB.WhiteKnight - , flags = flags `clearMask` (epMask .|. bit to) + , flags = flags `clearMask` (epMask .|. bit (unSquare to)) } _ -> error "Impossible: White tried to promote to Pawn" Black -> case piece of Queen -> pos { qbb = QBB.blackPromotion qbb from to QBB.BlackQueen - , flags = flags `clearMask` (epMask .|. bit to) - } + , flags = flags `clearMask` (epMask .|. bit (unSquare to)) + } Rook -> pos { qbb = QBB.blackPromotion qbb from to QBB.BlackRook - , flags = flags `clearMask` (epMask .|. bit to) + , flags = flags `clearMask` (epMask .|. bit (unSquare to)) } Bishop -> pos { qbb = QBB.blackPromotion qbb from to QBB.BlackBishop - , flags = flags `clearMask` (epMask .|. bit to) + , flags = flags `clearMask` (epMask .|. bit (unSquare to)) } Knight -> pos { qbb = QBB.blackPromotion qbb from to QBB.BlackKnight - , flags = flags `clearMask` (epMask .|. bit to) + , flags = flags `clearMask` (epMask .|. bit (unSquare to)) } _ -> error "Impossible: Black tried to promote to Pawn" - | QBB.pawns qbb `testMask` fromMask && - toMask .&. (rank3 .|. rank6) .&. flags /= 0 + | QBB.pawns qbb `testMask` fromMask + , toMask .&. (rank3 .|. rank6) .&. flags /= 0 = pos { qbb = qbb <> QBB.enPassant from to , flags = flags `clearMask` toMask } @@ -403,12 +462,14 @@ , flags = (flags `clearMask` (epMask .|. mask)) .|. dpp } where - !fromMask = 1 `unsafeShiftL` from - !toMask = 1 `unsafeShiftL` to + !fromMask = 1 `unsafeShiftL` unSquare from + !toMask = 1 `unsafeShiftL` unSquare to !mask = fromMask .|. toMask dpp = case color pos of - White | fromMask .&. rank2 .&. QBB.wPawns qbb /= 0 && from + 16 == to -> shiftN fromMask - Black | fromMask .&. rank7 .&. QBB.bPawns qbb /= 0 && from - 16 == to -> shiftS fromMask + White | fromMask .&. rank2 .&. QBB.wPawns qbb /= 0 + , unSquare from + 16 == unSquare to -> shiftN fromMask + Black | fromMask .&. rank7 .&. QBB.bPawns qbb /= 0 + , unSquare from - 16 == unSquare to -> shiftS fromMask _ -> 0 -- | Generate a list of possible moves for the given position. @@ -446,14 +507,14 @@ | otherwise = ml bLong ml | canCastleQueenside' pos occ = bQscm : ml | otherwise = ml - mkM !from ms !to = move from to : ms + mkM !from ms !to = move (Sq from) (Sq to) : ms -- | Returns 'True' if 'Color' is in check in the given position. inCheck :: Color -> Position -> Bool inCheck White Position{qbb} = - attackedBy Black qbb (occupied qbb) (bitScanForward (QBB.wKings qbb)) + attackedBy Black qbb (occupied qbb) (Sq (bitScanForward (QBB.wKings qbb))) inCheck Black Position{qbb} = - attackedBy White qbb (occupied qbb) (bitScanForward (QBB.bKings qbb)) + attackedBy White qbb (occupied qbb) (Sq (bitScanForward (QBB.bKings qbb))) wPawnMoves :: Word64 -> Word64 -> Word64 -> [Ply] -> [Ply] wPawnMoves !pawns !emptySquares !opponentPieces = @@ -469,7 +530,7 @@ mkPly diff ms tsq | tsq >= 56 = (promoteTo m <$> [Queen, Rook, Bishop, Knight]) <> ms | otherwise = m : ms - where m = move (tsq - diff) tsq + where m = move (Sq (tsq - diff)) (Sq tsq) bPawnMoves :: Word64 -> Word64 -> Word64 -> [Ply] -> [Ply] bPawnMoves !pawns !emptySquares !opponentPieces = @@ -485,19 +546,19 @@ mkPly diff ms tsq | tsq <= 7 = (promoteTo m <$> [Queen, Rook, Bishop, Knight]) <> ms | otherwise = m : ms - where m = move (tsq + diff) tsq + where m = move (Sq (tsq + diff)) (Sq tsq) slideMoves :: PieceType -> Position -> Word64 -> Word64 -> [Ply] -> [Ply] slideMoves piece (Position bb c _ _ _) !notOurs !occ = flip (foldBits gen) pieces where gen ms from = foldBits (mkPly from) ms (targets from) - mkPly from ms to = move from to : ms + mkPly from ms to = move (Sq from) (Sq to) : ms targets sq = case piece of - Rook -> rookTargets sq occ .&. notOurs + Rook -> rookTargets sq occ .&. notOurs Bishop -> bishopTargets sq occ .&. notOurs - Queen -> queenTargets sq occ .&. notOurs - _ -> error "Not a sliding piece" + Queen -> queenTargets sq occ .&. notOurs + _ -> error "Not a sliding piece" pieces = case (c, piece) of (White, Bishop) -> QBB.wBishops bb (Black, Bishop) -> QBB.bBishops bb @@ -505,7 +566,7 @@ (Black, Rook) -> QBB.bRooks bb (White, Queen) -> QBB.wQueens bb (Black, Queen) -> QBB.bQueens bb - _ -> 0 + _ -> 0 data Castle = Kingside | Queenside deriving (Eq, Ix, Ord, Show) @@ -520,10 +581,10 @@ bqs xs | flags `testMask` crbQs = (Black, Queenside):xs | otherwise = xs -enPassantSquare :: Position -> Maybe Sq +enPassantSquare :: Position -> Maybe Square enPassantSquare Position{flags} = case flags .&. epMask of 0 -> Nothing - x -> Just $ toEnum $ bitScanForward x + x -> Just . Sq . bitScanForward $ x canCastleKingside, canCastleQueenside :: Position -> Bool canCastleKingside pos@Position{qbb} = canCastleKingside' pos (occupied qbb) @@ -533,7 +594,7 @@ canCastleKingside' Position{qbb, color = White, flags} !occ = flags `testMask` crwKs && occ .&. crwKe == 0 && not (any (attackedBy Black qbb occ) [E1, F1, G1]) -canCastleKingside' Position{qbb, color = Black, flags} !occ = +canCastleKingside' Position{qbb, color = Black, flags} !occ = flags `testMask` crbKs && occ .&. crbKe == 0 && not (any (attackedBy White qbb occ) [E8, F8, G8]) canCastleQueenside' Position{qbb, color = White, flags} !occ = @@ -549,8 +610,8 @@ bKscm = move E8 G8 bQscm = move E8 C8 -attackedBy :: IsSquare sq => Color -> QuadBitboard -> Word64 -> sq -> Bool -attackedBy White qbb !occ (toIndex -> sq) +attackedBy :: Color -> QuadBitboard -> Word64 -> Square -> Bool +attackedBy White qbb !occ (unSquare -> sq) | (wPawnAttacks ! sq) .&. QBB.wPawns qbb /= 0 = True | (knightAttacks ! sq) .&. QBB.wKnights qbb /= 0 = True | bishopTargets sq occ .&. QBB.wBishops qbb /= 0 = True @@ -558,7 +619,7 @@ | queenTargets sq occ .&. QBB.wQueens qbb /= 0 = True | (kingAttacks ! sq) .&. QBB.wKings qbb /= 0 = True | otherwise = False -attackedBy Black qbb !occ (toIndex -> sq) +attackedBy Black qbb !occ (unSquare -> sq) | (bPawnAttacks ! sq) .&. QBB.bPawns qbb /= 0 = True | (knightAttacks ! sq) .&. QBB.bKnights qbb /= 0 = True | bishopTargets sq occ .&. QBB.bBishops qbb /= 0 = True @@ -617,7 +678,7 @@ getRayTargets :: Int -> Direction -> Word64 -> Word64 getRayTargets sq dir occ = blocked $ attacks .&. occ where - blocked 0 = attacks + blocked 0 = attacks blocked bb = attacks `xor` (ray ! bitScan bb) attacks = ray ! sq (bitScan, ray) = case dir of diff --git a/src/Game/Chess/Internal/ECO.hs b/src/Game/Chess/Internal/ECO.hs new file mode 100644 --- /dev/null +++ b/src/Game/Chess/Internal/ECO.hs @@ -0,0 +1,167 @@ +{-# LANGUAGE GADTs #-} +{-# LANGUAGE RankNTypes #-} +{-# LANGUAGE TemplateHaskell #-} +module Game.Chess.Internal.ECO where + +import Control.DeepSeq +import Control.Exception (Exception (displayException), + throwIO) +import Control.Monad +import Control.Monad.IO.Class +import Data.Bifunctor +import Data.Binary +import Data.ByteString.Char8 (ByteString) +import qualified Data.ByteString.Char8 as BS +import qualified Data.ByteString.Lazy.Char8 as Lazy +import Data.Char +import Data.Data +import Data.Either (fromRight) +import Data.FileEmbed (embedFile) +import Data.Foldable (fold) +import Data.Functor +import Data.HashMap.Strict (HashMap) +import qualified Data.HashMap.Strict as HashMap +import Data.Hashable (Hashable) +import Data.Maybe +import Data.MonoTraversable (MonoFoldable (ofoldl')) +import Data.Ord +import Data.Ratio +import Data.Text (Text) +import qualified Data.Text as T +import Data.Tree (foldTree) +import Data.Typeable (Typeable) +import Data.Vector.Binary +import Data.Vector.Instances +import qualified Data.Vector.Unboxed as Unboxed +import Data.Void +import Data.Word (Word8) +import GHC.Generics (Generic) +import Game.Chess +import Game.Chess.PGN +import Game.Chess.SAN +import Instances.TH.Lift +import Language.Haskell.TH.Syntax (Lift, Q, TExp, liftTyped) +import Prelude hiding (lookup) +import qualified Prelude +import System.IO +import Text.Megaparsec +import Text.Megaparsec.Byte +import qualified Text.Megaparsec.Byte.Lexer as L + +-- | A Chess Opening +data Opening = CO { + coCode :: !Text +, coName :: !Text +, coVariation :: !(Maybe Text) +, coPlies :: !(Unboxed.Vector Ply) +} deriving (Eq, Generic, Lift, Show) + +instance Binary Opening +instance Hashable Opening +instance NFData Opening + +type FileReader = forall m. MonadIO m => FilePath -> m (Either String [Opening]) + +-- | Parse an ECO database in .pgn format +ecoPgn :: FileReader +ecoPgn fp = fmap fromPGN' <$> readPGNFile fp + +-- | Parse an ECO database in .eco format +scidEco :: FileReader +scidEco fp = first errorBundlePretty . parse scid' fp <$> liftIO (BS.readFile fp) + +-- | Encyclopedia of Chess Openings +newtype ECO = ECO { toHashMap :: HashMap Position Opening } + deriving (Eq, NFData, Hashable, Semigroup, Monoid) + +instance Binary ECO where + put = put . toList + get = fromList <$> get + +embedECO :: FileReader -> FilePath -> Q (TExp ECO) +embedECO load fp = (fmap.fmap) liftTyped (load fp) >>= \case + Right xs -> [|| fromList $$(xs) ||] + Left err -> fail err + +toList :: ECO -> [Opening] +toList = map snd . HashMap.toList . toHashMap + +fromList :: [Opening] -> ECO +fromList = ECO . HashMap.fromList . fmap (\co -> (pos co, co)) where + pos = ofoldl' unsafeDoPly startpos . coPlies + +-- | Convert a PGN database to ECO assuming the ECO, Opening and Variation tags are +-- being used to identify chess openings. +fromPGN :: PGN -> ECO +fromPGN = fromList . fromPGN' + +fromPGN' :: PGN -> [Opening] +fromPGN' (PGN games) = map mkCO games where + mkCO (tags, (_, forest)) = CO { .. } where + coCode = fromMaybe "" $ Prelude.lookup "ECO" tags + coName = fromMaybe "" $ Prelude.lookup "Opening" tags + coVariation = Prelude.lookup "Variation" tags + coPlies = Unboxed.fromList . head . concatMap (foldTree g) $ forest where + g a [] = [[pgnPly a]] + g a xs = (pgnPly a :) <$> fold xs + +opening :: Parser Opening +opening = CO <$> lexeme code <*> lexeme var <*> pure Nothing <*> lexeme (plies startpos) + +code :: Parser Text +code = p "code" where + p = f <$> alphaNumChar <*> many digitChar <*> optional alphaNumChar + f x xs y = let s = x : xs in T.pack . fmap (chr . fromEnum) $ case y of + Nothing -> s + Just y' -> s ++ [y'] + +var :: Parser Text +var = p "string" where + p = fmap (T.pack . fmap (chr . fromEnum)) $ single quoteChar *> many ch <* single quoteChar + ch = single backslashChar *> ( single backslashChar $> backslashChar + <|> single quoteChar $> quoteChar + ) + <|> anySingleBut quoteChar + +plies :: Position -> Parser (Unboxed.Vector Ply) +plies = fmap Unboxed.fromList . go where + go p = eol <|> line where + eol = lexeme (string "*") $> [] + line = ply >>= \pl -> (pl :) <$> go (unsafeDoPly p pl) + ply = validateMoveNumber p *> lexeme (relaxedSAN p) + validateMoveNumber p = + optional (lexeme $ L.decimal <* space <* many (single periodChar)) >>= \case + Just n | moveNumber p /= n -> + fail $ "Invalid move number: " <> show n <> " /= " <> show (moveNumber p) + _ -> pure () + +-- | A parser for opening databases in SCID .eco format +scid :: Parser ECO +scid = fromList <$> scid' + +scid' :: Parser [Opening] +scid' = spaceConsumer *> many opening <* eof + +readECOPGNFile :: MonadIO m => FilePath -> m (Either String ECO) +readECOPGNFile = (fmap . fmap) fromList . ecoPgn + +readSCIDECOFile :: MonadIO m => FilePath -> m (Either String ECO) +readSCIDECOFile = (fmap . fmap) fromList . scidEco + +-- | Retrieve the opening for a particular position +lookup :: Position -> ECO -> Maybe Opening +lookup pos = HashMap.lookup pos . toHashMap + +type Parser = Parsec Void ByteString + +spaceConsumer :: Parser () +spaceConsumer = L.space + space1 (L.skipLineComment "#") (L.skipBlockComment "{" "}") + +lexeme :: Parser a -> Parser a +lexeme = L.lexeme spaceConsumer + +periodChar, quoteChar, backslashChar :: Word8 +periodChar = fromIntegral $ ord '.' +quoteChar = fromIntegral $ ord '"' +backslashChar = fromIntegral $ ord '\\' diff --git a/src/Game/Chess/Internal/QuadBitboard.hs b/src/Game/Chess/Internal/QuadBitboard.hs --- a/src/Game/Chess/Internal/QuadBitboard.hs +++ b/src/Game/Chess/Internal/QuadBitboard.hs @@ -30,36 +30,39 @@ , whitePromotion, blackPromotion, whitePromotion', blackPromotion' ) where -import Control.Applicative (liftA2) -import Data.Bifunctor (first) -import Data.Binary ( Binary(put, get) ) -import Data.Bits - ( Bits((.|.), (.&.), xor, complement - , unsafeShiftR, unsafeShiftL, testBit, setBit, clearBit, popCount) - , FiniteBits(..) ) -import Data.Char (ord, toLower) -import Data.Ix ( Ix(inRange) ) -import Data.List ( groupBy, intercalate ) -import Data.String ( IsString(..) ) -import qualified Data.Vector.Generic as G +import Control.Applicative (liftA2) +import Control.DeepSeq +import Control.Lens (view, (^.)) +import Control.Lens.Iso (from) +import Data.Bifunctor (first) +import Data.Binary (Binary (get, put)) +import Data.Bits (Bits (clearBit, complement, popCount, setBit, testBit, unsafeShiftL, unsafeShiftR, xor, (.&.), (.|.)), + FiniteBits (..)) +import Data.Char (ord, toLower) +import Data.Hashable +import Data.Ix (Ix (inRange)) +import Data.List (groupBy, intercalate) +import Data.String (IsString (..)) +import qualified Data.Vector.Generic as G import qualified Data.Vector.Generic.Mutable as M -import Data.Vector.Unboxed (Vector, MVector, Unbox) -import Data.Word (Word8, Word64) -import Foreign.Storable -import Game.Chess.Internal.Square (toIndex, toRF, Sq(A8)) -import GHC.Enum - ( boundedEnumFrom, - boundedEnumFromThen, - predError, - succError, - toEnumError ) -import GHC.Exts (IsList(Item, fromList, toList)) -import GHC.Ptr ( castPtr, plusPtr ) -import Numeric (showHex) +import Data.Vector.Unboxed (MVector, Unbox, Vector) +import Data.Word (Word64, Word8) +import Foreign.Storable +import GHC.Enum (boundedEnumFrom, + boundedEnumFromThen, predError, + succError, toEnumError) +import GHC.Exts (IsList (Item, fromList, toList)) +import GHC.Generics (Generic) +import GHC.Ptr (castPtr, plusPtr) +import Game.Chess.Internal.Square +import Language.Haskell.TH.Syntax (Lift) +import Numeric (showHex) data QuadBitboard = QBB { black, pbq, nbk, rqk :: {-# UNPACK #-} !Word64 } - deriving Eq + deriving (Eq, Generic, Lift) +instance NFData QuadBitboard + occupied, pnr, white, pawns, knights, bishops, rooks, queens, kings :: QuadBitboard -> Word64 occupied = liftA2 (.|.) pbq $ liftA2 (.|.) nbk rqk pnr = liftA2 xor pbq $ liftA2 xor nbk rqk @@ -131,13 +134,13 @@ pattern BlackKing = 13 instance IsList QuadBitboard where - type Item QuadBitboard = (Sq, Word4) - fromList = mconcat . map (uncurry singleton . first toIndex) + type Item QuadBitboard = (Square, Word4) + fromList = mconcat . map (uncurry singleton) toList qbb = go maxBound [] where go sq xs | sq /= minBound = go (pred sq) xs' | otherwise = xs' - where nb = qbb ! toIndex sq + where nb = qbb ! sq xs' | nb /= NoPiece = (sq, nb) : xs | otherwise = xs @@ -260,13 +263,13 @@ -- | law: singleton i x ! i = x where inRange (0,63) i && inRange (0,15) x {-# INLINE singleton #-} -singleton :: Int -> Word4 -> QuadBitboard -singleton !sq !nb = QBB (f 0) (f 1) (f 2) (f 3) where +singleton :: Square -> Word4 -> QuadBitboard +singleton (Sq sq) !nb = QBB (f 0) (f 1) (f 2) (f 3) where !b = 1 `unsafeShiftL` sq f !n = fromIntegral ((nb `unsafeShiftR` n) .&. 1) * b -(!) :: QuadBitboard -> Int -> Word4 -(!) QBB{..} sq = fromIntegral $ f black 0 .|. f pbq 1 .|. f nbk 2 .|. f rqk 3 where +(!) :: QuadBitboard -> Square -> Word4 +(!) QBB{..} (Sq sq) = fromIntegral $ f black 0 .|. f pbq 1 .|. f nbk 2 .|. f rqk 3 where f !bb !n = ((bb `unsafeShiftR` sq) .&. 1) `unsafeShiftL` n setNibble :: Bits nibble => QuadBitboard -> Int -> nibble -> QuadBitboard @@ -274,17 +277,16 @@ f n | nb `testBit` n = (`setBit` sq) | otherwise = (`clearBit` sq) -instance Binary QuadBitboard where - get = QBB <$> get <*> get <*> get <*> get - put QBB{..} = put black *> put pbq *> put nbk *> put rqk +instance Binary QuadBitboard instance IsString QuadBitboard where - fromString = go (toRF A8) mempty where + fromString = go (view rankFile A8) mempty where go _ !qbb "" = qbb - go (!r,_) qbb ('/':xs) = go (r - 1, 0) qbb xs - go rf@(!r,!f) !qbb (x:xs) - | inRange ('1','8') x = go (r, f + ord x - ord '0') qbb xs - | otherwise = go (r, f + 1) (qbb <> singleton (toIndex rf) nb) xs where + go (r, _) qbb ('/':xs) = go (pred r, FileA) qbb xs + go rf@(r, f) !qbb (x:xs) + | inRange ('1','8') x = go (r, mkFile $ unFile f + ord x - ord '0') qbb xs + | otherwise = go (r, succ f) (qbb <> singleton sq nb) xs where + sq = view (from rankFile) rf nb = case x of 'P' -> WhitePawn 'N' -> WhiteKnight @@ -300,6 +302,10 @@ 'k' -> BlackKing _ -> error $ "QuadBitBoard.fromString: Illegal FEN character " <> show x +instance Hashable QuadBitboard where + hashWithSalt s QBB{black, pbq, nbk, rqk} = + s `hashWithSalt` black `hashWithSalt` pbq `hashWithSalt` nbk `hashWithSalt` rqk + instance Show QuadBitboard where show QBB{..} = "QBB {black = 0x" <> showHex black @@ -308,46 +314,46 @@ (", rqk = 0x" <> showHex rqk "}"))) toString :: QuadBitboard -> String -toString qbb = intercalate "/" $ rank <$> [7, 6..0] where - rank r = concatMap countEmpty . groupBy spaces $ charAt r <$> [0..7] +toString qbb = intercalate "/" $ rank <$> [Rank8, Rank7 .. Rank1] where + rank r = concatMap countEmpty . groupBy spaces $ charAt r <$> [FileA .. FileH] countEmpty xs | head xs == spc = show $ length xs | otherwise = xs spaces x y = x == spc && x == y charAt r f = maybe spc (if odd nb then toLower else id) $ lookup (nb `div` 2) $ zip [1..] "PNBRQK" - where nb = qbb ! (r*8+f) + where nb = qbb ! ((r, f) ^. from rankFile) spc = ' ' -- | Move a nibble. Note that this function, while convenient, isn't very -- fast as it needs to lookup the source nibble value. -move :: QuadBitboard -> Int -> Int -> QuadBitboard +move :: QuadBitboard -> Square -> Square -> QuadBitboard move qbb fromSq toSq = qbb <> move' fromSq (qbb ! fromSq) toSq (qbb ! toSq) -move' :: Int -> Word4 -> Int -> Word4 -> QuadBitboard +move' :: Square -> Word4 -> Square -> Word4 -> QuadBitboard move' fromSq fromCode toSq toCode = singleton fromSq fromCode <> singleton toSq (fromCode `xor` toCode) whiteKingsideCastle, whiteQueensideCastle, blackKingsideCastle, blackQueensideCastle :: QuadBitboard -whiteKingsideCastle = move' 4 WhiteKing 6 NoPiece <> move' 7 WhiteRook 5 NoPiece -whiteQueensideCastle = move' 4 WhiteKing 2 NoPiece <> move' 0 WhiteRook 3 NoPiece -blackKingsideCastle = move' 60 BlackKing 62 NoPiece <> move' 63 BlackRook 61 NoPiece -blackQueensideCastle = move' 60 BlackKing 58 NoPiece <> move' 56 BlackRook 59 NoPiece +whiteKingsideCastle = move' E1 WhiteKing G1 NoPiece <> move' H1 WhiteRook F1 NoPiece +whiteQueensideCastle = move' E1 WhiteKing C1 NoPiece <> move' A1 WhiteRook D1 NoPiece +blackKingsideCastle = move' E8 BlackKing G8 NoPiece <> move' H8 BlackRook F8 NoPiece +blackQueensideCastle = move' E8 BlackKing C8 NoPiece <> move' A8 BlackRook D8 NoPiece -enPassant :: Int -> Int -> QuadBitboard +enPassant :: Square -> Square -> QuadBitboard enPassant fromSq toSq - | fromSq < toSq - = move' fromSq WhitePawn toSq NoPiece <> singleton (toSq-8) BlackPawn + | unSquare fromSq < unSquare toSq + = move' fromSq WhitePawn toSq NoPiece <> singleton (mkSq $ unSquare toSq - 8) BlackPawn | otherwise - = move' fromSq BlackPawn toSq NoPiece <> singleton (toSq+8) WhitePawn + = move' fromSq BlackPawn toSq NoPiece <> singleton (mkSq $ unSquare toSq + 8) WhitePawn -whitePromotion, blackPromotion :: QuadBitboard -> Int -> Int -> Word4 -> QuadBitboard +whitePromotion, blackPromotion :: QuadBitboard -> Square -> Square -> Word4 -> QuadBitboard whitePromotion qbb fromSq toSq promoCode = qbb <> whitePromotion' fromSq toSq (qbb ! toSq) promoCode blackPromotion qbb fromSq toSq promoCode = qbb <> blackPromotion' fromSq toSq (qbb ! toSq) promoCode -whitePromotion', blackPromotion' :: Int -> Int -> Word4 -> Word4 -> QuadBitboard +whitePromotion', blackPromotion' :: Square -> Square -> Word4 -> Word4 -> QuadBitboard whitePromotion' fromSq toSq toCode promoCode = singleton fromSq WhitePawn <> singleton toSq (toCode `xor` promoCode) blackPromotion' fromSq toSq toCode promoCode = diff --git a/src/Game/Chess/Internal/Square.hs b/src/Game/Chess/Internal/Square.hs --- a/src/Game/Chess/Internal/Square.hs +++ b/src/Game/Chess/Internal/Square.hs @@ -1,43 +1,234 @@ -module Game.Chess.Internal.Square ( - IsSquare(..), Sq(..), isDark, isLight, toCoord -) where +module Game.Chess.Internal.Square where -import Data.Bits (Bits(testBit)) -import Data.Char (chr, ord) -import Data.Ix (Ix) -import Data.String (IsString(fromString)) -import Data.Word +import Control.Lens.Iso +import Data.Bits (Bits (testBit)) +import Data.Char (chr, ord) +import Data.Coerce (coerce) +import Data.Ix (Ix (..)) +import Data.String (IsString (fromString)) +import Data.Word +import GHC.Stack (HasCallStack) -class IsSquare sq where - toIndex :: sq -> Int - toRF :: sq -> (Int, Int) - toRF sq = toIndex sq `divMod` 8 +newtype Rank = Rank Int deriving (Eq, Ord) -instance IsSquare Int where - toIndex = id +unRank :: Rank -> Int +unRank = coerce -instance IsSquare (Int, Int) where - toIndex (r, f) = r*8 + f - toRF = id +mkRank :: HasCallStack => Int -> Rank +mkRank n | n >= 0 && n <= 7 = Rank n + | otherwise = error $ "mkRank " ++ show n -data Sq = A1 | B1 | C1 | D1 | E1 | F1 | G1 | H1 - | A2 | B2 | C2 | D2 | E2 | F2 | G2 | H2 - | A3 | B3 | C3 | D3 | E3 | F3 | G3 | H3 - | A4 | B4 | C4 | D4 | E4 | F4 | G4 | H4 - | A5 | B5 | C5 | D5 | E5 | F5 | G5 | H5 - | A6 | B6 | C6 | D6 | E6 | F6 | G6 | H6 - | A7 | B7 | C7 | D7 | E7 | F7 | G7 | H7 - | A8 | B8 | C8 | D8 | E8 | F8 | G8 | H8 - deriving (Bounded, Enum, Eq, Ix, Ord, Show, Read) +instance Show Rank where + showsPrec _ (Rank 0) = showString "Rank1" + showsPrec _ (Rank 1) = showString "Rank2" + showsPrec _ (Rank 2) = showString "Rank3" + showsPrec _ (Rank 3) = showString "Rank4" + showsPrec _ (Rank 4) = showString "Rank5" + showsPrec _ (Rank 5) = showString "Rank6" + showsPrec _ (Rank 6) = showString "Rank7" + showsPrec _ (Rank 7) = showString "Rank8" + showsPrec d (Rank n) = showParen (d > 10) $ + showString "Rank " . showsPrec 11 n -instance IsSquare Sq where - toIndex = fromEnum +instance Enum Rank where + toEnum n | n >= 0 && n <= 7 = Rank n + | otherwise = error $ "Rank out-of-bound " ++ show n + fromEnum = coerce -toCoord :: (IsSquare sq, IsString s) => sq -> s -toCoord (toRF -> (r,f)) = fromString [chr (f + ord 'a'), chr (r + ord '1')] +instance Bounded Rank where + minBound = Rank1 + maxBound = Rank8 -isDark :: IsSquare sq => sq -> Bool -isDark sq = (0xaa55aa55aa55aa55 :: Word64) `testBit` toIndex sq +pattern Rank1, Rank2, Rank3, Rank4, Rank5, Rank6, Rank7, Rank8 :: Rank +pattern Rank1 = Rank 0 +pattern Rank2 = Rank 1 +pattern Rank3 = Rank 2 +pattern Rank4 = Rank 3 +pattern Rank5 = Rank 4 +pattern Rank6 = Rank 5 +pattern Rank7 = Rank 6 +pattern Rank8 = Rank 7 -isLight :: IsSquare sq => sq -> Bool +{-# COMPLETE Rank1, Rank2, Rank3, Rank4, Rank5, Rank6, Rank7, Rank8 :: Rank #-} + +newtype File = File Int deriving (Eq, Ord) + +unFile :: File -> Int +unFile = coerce + +mkFile :: HasCallStack => Int -> File +mkFile n | n >= 0 && n <= 7 = File n + | otherwise = error $ "mkFile " ++ show n + +instance Show File where + showsPrec _ (File 0) = showString "FileA" + showsPrec _ (File 1) = showString "FileB" + showsPrec _ (File 2) = showString "FileC" + showsPrec _ (File 3) = showString "FileD" + showsPrec _ (File 4) = showString "FileE" + showsPrec _ (File 5) = showString "FileF" + showsPrec _ (File 6) = showString "FileG" + showsPrec _ (File 7) = showString "FileH" + showsPrec d (File n) = showParen (d > 10) $ + showString "File " . showsPrec 11 n + +instance Enum File where + toEnum n | n >= 0 && n <= 7 = File n + | otherwise = error $ "File out-of-bound " ++ show n + fromEnum = coerce + +instance Bounded File where + minBound = FileA + maxBound = FileH + +pattern FileA, FileB, FileC, FileD, FileE, FileF, FileG, FileH :: File +pattern FileA = File 0 +pattern FileB = File 1 +pattern FileC = File 2 +pattern FileD = File 3 +pattern FileE = File 4 +pattern FileF = File 5 +pattern FileG = File 6 +pattern FileH = File 7 + +{-# COMPLETE FileA, FileB, FileC, FileD, FileE, FileF, FileG, FileH :: File #-} + +newtype Square = Sq Int deriving (Eq, Ord) + +instance Ix Square where + range (Sq i, Sq j) = [Sq k | k <- [i..j]] + index (Sq i, Sq j) (Sq k) = index (i, j) k + inRange (Sq i, Sq j) (Sq k) = inRange (i, j) k + rangeSize (Sq i, Sq j) = j - i + +unSquare :: Square -> Int +unSquare = coerce +{-# INLINE unSquare #-} + +-- TODO: this check is expensive, maybe only worth in "debug" builds. +mkSq :: HasCallStack => Int -> Square +mkSq n | n >= 0 && n <= 63 = Sq n + | otherwise = error $ "mkSq " ++ show n + +instance Show Square where + showsPrec d (Sq i) | i >= 0 && i <= 63 = showString [f', r'] + | otherwise = showParen (d > 10) $ + showString "Sq " . showsPrec 11 i + where + (r, f) = i `divMod` 8 + r' = chr (r + ord '1') + f' = chr (f + ord 'A') + +instance Enum Square where + toEnum n | n >= 0 && n <= 63 = Sq n + | otherwise = error $ "Sq out-of-bound " ++ show n + fromEnum = coerce + +instance Bounded Square where + minBound = A1 + maxBound = H8 + +pattern A1, A2, A3, A4, A5, A6, A7, A8 :: Square +pattern B1, B2, B3, B4, B5, B6, B7, B8 :: Square +pattern C1, C2, C3, C4, C5, C6, C7, C8 :: Square +pattern D1, D2, D3, D4, D5, D6, D7, D8 :: Square +pattern E1, E2, E3, E4, E5, E6, E7, E8 :: Square +pattern F1, F2, F3, F4, F5, F6, F7, F8 :: Square +pattern G1, G2, G3, G4, G5, G6, G7, G8 :: Square +pattern H1, H2, H3, H4, H5, H6, H7, H8 :: Square + +pattern A1 = Sq 0 +pattern B1 = Sq 1 +pattern C1 = Sq 2 +pattern D1 = Sq 3 +pattern E1 = Sq 4 +pattern F1 = Sq 5 +pattern G1 = Sq 6 +pattern H1 = Sq 7 + +pattern A2 = Sq 8 +pattern B2 = Sq 9 +pattern C2 = Sq 10 +pattern D2 = Sq 11 +pattern E2 = Sq 12 +pattern F2 = Sq 13 +pattern G2 = Sq 14 +pattern H2 = Sq 15 + +pattern A3 = Sq 16 +pattern B3 = Sq 17 +pattern C3 = Sq 18 +pattern D3 = Sq 19 +pattern E3 = Sq 20 +pattern F3 = Sq 21 +pattern G3 = Sq 22 +pattern H3 = Sq 23 + +pattern A4 = Sq 24 +pattern B4 = Sq 25 +pattern C4 = Sq 26 +pattern D4 = Sq 27 +pattern E4 = Sq 28 +pattern F4 = Sq 29 +pattern G4 = Sq 30 +pattern H4 = Sq 31 + +pattern A5 = Sq 32 +pattern B5 = Sq 33 +pattern C5 = Sq 34 +pattern D5 = Sq 35 +pattern E5 = Sq 36 +pattern F5 = Sq 37 +pattern G5 = Sq 38 +pattern H5 = Sq 39 + +pattern A6 = Sq 40 +pattern B6 = Sq 41 +pattern C6 = Sq 42 +pattern D6 = Sq 43 +pattern E6 = Sq 44 +pattern F6 = Sq 45 +pattern G6 = Sq 46 +pattern H6 = Sq 47 + +pattern A7 = Sq 48 +pattern B7 = Sq 49 +pattern C7 = Sq 50 +pattern D7 = Sq 51 +pattern E7 = Sq 52 +pattern F7 = Sq 53 +pattern G7 = Sq 54 +pattern H7 = Sq 55 + +pattern A8 = Sq 56 +pattern B8 = Sq 57 +pattern C8 = Sq 58 +pattern D8 = Sq 59 +pattern E8 = Sq 60 +pattern F8 = Sq 61 +pattern G8 = Sq 62 +pattern H8 = Sq 63 + +rank :: Square -> Rank +rank = Rank . (`div` 8) . coerce + +file :: Square -> File +file = File . (`mod` 8) . coerce + +rankFile :: Iso' Square (Rank, File) +rankFile = iso f g where + f (Sq i) = case i `divMod` 8 of (r, f) -> (Rank r, File f) + g (Rank r, File f) = Sq $ r*8 + f + +fileChar, rankChar :: Square -> Char +fileChar = chr . (ord 'a' +) . unFile . file +rankChar = chr . (ord '1' +) . unRank . rank + +toCoord :: IsString s => Square -> s +toCoord sq = fromString $ ($ sq) <$> [fileChar, rankChar] + +isDark :: Square -> Bool +isDark (Sq i) = (0xaa55aa55aa55aa55 :: Word64) `testBit` i + +isLight :: Square -> Bool isLight = not . isDark diff --git a/src/Game/Chess/PGN.hs b/src/Game/Chess/PGN.hs --- a/src/Game/Chess/PGN.hs +++ b/src/Game/Chess/PGN.hs @@ -1,34 +1,47 @@ {-# LANGUAGE GADTs #-} +{-| +Module : Game.Chess.PGN +Description : Portable Game Notation +Copyright : (c) Mario Lang, 2021 +License : BSD3 +Maintainer : mlang@blind.guru +Stability : experimental + +A PGN file consists of a list of games. +Each game consists of a tag list, the outcome, and a forest of rosetrees. +-} module Game.Chess.PGN ( - readPGNFile, gameFromForest, pgnForest, PGN(..), Game(..), Outcome(..) + readPGNFile, gameFromForest, pgnForest, PGN(..), Game(..), Outcome(..), PlyData(..) +, pgn , hPutPGN, pgnDoc, RAVOrder, breadthFirst, depthFirst, gameDoc , weightedForest ) where -import Control.Monad -import Data.Bifunctor -import Data.ByteString.Char8 (ByteString) -import qualified Data.ByteString.Char8 as BS -import Data.Char -import Data.Foldable -import Data.Functor -import Data.List -import Data.Maybe -import Data.Ord -import Data.Ratio -import Data.Text (Text) -import qualified Data.Text as T -import Data.Text.Prettyprint.Doc hiding (space) -import Data.Text.Prettyprint.Doc.Render.Text -import Data.Tree -import Data.Word -import Data.Void -import Game.Chess -import Game.Chess.SAN -import System.IO -import Text.Megaparsec -import Text.Megaparsec.Byte -import qualified Text.Megaparsec.Byte.Lexer as L +import Control.Monad +import Control.Monad.IO.Class +import Data.Bifunctor +import Data.ByteString.Char8 (ByteString) +import qualified Data.ByteString.Char8 as BS +import Data.Char +import Data.Foldable +import Data.Functor +import Data.List +import Data.Maybe +import Data.Ord +import Data.Ratio +import Data.Text (Text) +import qualified Data.Text as T +import Data.Text.Prettyprint.Doc hiding (space) +import Data.Text.Prettyprint.Doc.Render.Text +import Data.Tree +import Data.Void +import Data.Word +import Game.Chess +import Game.Chess.SAN +import System.IO +import Text.Megaparsec +import Text.Megaparsec.Byte +import qualified Text.Megaparsec.Byte.Lexer as L gameFromForest :: [(ByteString, Text)] -> Forest Ply -> Outcome -> Game gameFromForest tags forest o = (("Result", r):tags, (o, (fmap . fmap) f forest)) where @@ -59,12 +72,12 @@ instance Ord Outcome where - Win _ `compare` Win _ = EQ - Win _ `compare` _ = GT - _ `compare` Win _ = LT - Draw `compare` Draw = EQ - Draw `compare` _ = GT - _ `compare` Draw = LT + Win _ `compare` Win _ = EQ + Win _ `compare` _ = GT + _ `compare` Win _ = LT + Draw `compare` Draw = EQ + Draw `compare` _ = GT + _ `compare` Draw = LT Undecided `compare` Undecided = EQ instance Pretty Outcome where @@ -75,12 +88,12 @@ data PlyData = PlyData { prefixNAG :: ![Int] -, pgnPly :: !Ply +, pgnPly :: !Ply , suffixNAG :: ![Int] } deriving (Eq, Show) -readPGNFile :: FilePath -> IO (Either String PGN) -readPGNFile fp = first errorBundlePretty . parse pgn fp <$> BS.readFile fp +readPGNFile :: MonadIO m => FilePath -> m (Either String PGN) +readPGNFile fp = liftIO $ first errorBundlePretty . parse pgn fp <$> BS.readFile fp hPutPGN :: Handle -> RAVOrder (Doc ann) -> PGN -> IO () hPutPGN h ro (PGN games) = for_ games $ \g -> do @@ -165,17 +178,17 @@ pos <- case lookup "FEN" tl of Nothing -> pure startpos Just fen -> case fromFEN (T.unpack fen) of - Just p -> pure p + Just p -> pure p Nothing -> fail "Invalid FEN" (tl,) <$> movetext pos - + str :: Parser Text str = p "string" where p = fmap (T.pack . fmap (chr . fromEnum)) $ single quoteChar *> many ch <* single quoteChar ch = single backslashChar *> ( single backslashChar $> backslashChar - <|> single quoteChar $> quoteChar - ) - <|> anySingleBut quoteChar + <|> single quoteChar $> quoteChar + ) + <|> anySingleBut quoteChar type RAVOrder a = (Forest PlyData -> a) -> Forest PlyData -> [a] @@ -200,8 +213,8 @@ tagpair (k, esc -> v) = brackets $ pretty (BS.unpack k) <+> dquotes (pretty v) esc = T.concatMap e where e '\\' = T.pack "\\\\" - e '"' = T.pack "\\\"" - e c = T.singleton c + e '"' = T.pack "\\\"" + e c = T.singleton c moveDoc :: RAVOrder (Doc ann) -> Position -> (Outcome, Forest PlyData) -> Doc ann moveDoc ro p (o,f) = fillSep (go p True f <> [pretty o]) <> line where @@ -231,7 +244,7 @@ | otherwise = 0 f pos (Node a ts') = Node (w (color pos), pgnPly a) $ f (unsafeDoPly pos (pgnPly a)) <$> ts' - trunk [] = [] + trunk [] = [] trunk (x:_) = [x { subForest = trunk (subForest x)}] merge [] = [] merge ((Node a ts) : xs) = diff --git a/src/Game/Chess/Polyglot.hs b/src/Game/Chess/Polyglot.hs --- a/src/Game/Chess/Polyglot.hs +++ b/src/Game/Chess/Polyglot.hs @@ -1,5 +1,5 @@ {-# LANGUAGE ScopedTypeVariables #-} -{-# LANGUAGE TemplateHaskell #-} +{-# LANGUAGE TemplateHaskell #-} module Game.Chess.Polyglot ( -- * Data type PolyglotBook @@ -17,34 +17,34 @@ , findPosition ) where -import Control.Arrow -import Control.Monad.Random (Rand) -import qualified Control.Monad.Random as Rand -import Data.Bits -import Data.ByteString (ByteString) +import Control.Arrow +import Control.Monad.Random (Rand) +import qualified Control.Monad.Random as Rand +import Data.Bits +import Data.ByteString (ByteString) +import qualified Data.ByteString as BS import qualified Data.ByteString.Internal as BS -import qualified Data.ByteString as BS -import Data.FileEmbed -import Data.Foldable (fold) -import Data.List -import Data.Ord -import Data.String (IsString(fromString)) -import qualified Data.Vector.Storable as VS -import Data.Tree -import Data.Word -import Foreign.ForeignPtr (castForeignPtr, plusForeignPtr) -import Foreign.Storable -import Game.Chess.Internal -import Game.Chess.PGN -import Game.Chess.Polyglot.Hash -import GHC.Ptr (Ptr, castPtr, plusPtr) -import System.Random (RandomGen) +import Data.FileEmbed +import Data.Foldable (fold) +import Data.List +import Data.Ord +import Data.String (IsString (fromString)) +import Data.Tree +import qualified Data.Vector.Storable as VS +import Data.Word +import Foreign.ForeignPtr (castForeignPtr, plusForeignPtr) +import Foreign.Storable +import GHC.Ptr (Ptr, castPtr, plusPtr) +import Game.Chess.Internal +import Game.Chess.PGN +import Game.Chess.Polyglot.Hash +import System.Random (RandomGen) data BookEntry = BookEntry { - key :: {-# UNPACK #-} !Word64 -, ply :: {-# UNPACK #-} !Ply + key :: {-# UNPACK #-} !Word64 +, ply :: {-# UNPACK #-} !Ply , weight :: {-# UNPACK #-} !Word16 -, learn :: {-# UNPACK #-} !Word32 +, learn :: {-# UNPACK #-} !Word32 } deriving (Eq, Show) instance Ord BookEntry where @@ -67,12 +67,12 @@ peekBE :: forall a. (Bits a, Num a, Storable a) => Ptr Word8 -> IO a peekBE ptr = go ptr 0 (sizeOf (undefined :: a)) where go _ !x 0 = pure x - go !p !x !n = peek p >>= \w8 -> + go !p !x !n = peek p >>= \w8 -> go (p `plusPtr` 1) (x `shiftL` 8 .|. fromIntegral w8) (n - 1) pokeBE :: forall a. (Bits a, Integral a, Num a, Storable a) => Ptr Word8 -> a -> IO () pokeBE p x = go x (sizeOf x) where - go _ 0 = pure () + go _ 0 = pure () go !v !n = pokeElemOff p (n-1) (fromIntegral v) *> go (v `shiftR` 8) (n-1) defaultBook, twic :: PolyglotBook @@ -134,7 +134,7 @@ bookPly :: RandomGen g => PolyglotBook -> Position -> Maybe (Rand g Ply) bookPly b pos = case findPosition b pos of [] -> Nothing - l -> Just . Rand.fromList $ map (ply &&& fromIntegral . weight) l + l -> Just . Rand.fromList $ map (ply &&& fromIntegral . weight) l -- | Probe the book for all plies known for the given position. bookPlies :: PolyglotBook -> Position -> [Ply] diff --git a/src/Game/Chess/Polyglot/Hash.hs b/src/Game/Chess/Polyglot/Hash.hs --- a/src/Game/Chess/Polyglot/Hash.hs +++ b/src/Game/Chess/Polyglot/Hash.hs @@ -2,16 +2,16 @@ hashPosition, pieceKey, castleKey, epKeys, turnKey ) where -import Data.Bits -import Data.Maybe +import Data.Bits +import Data.Ix +import Data.Maybe import qualified Data.Vector.Unboxed as Unboxed -import Data.Ix -import Data.Word -import Game.Chess +import Data.Word +import Game.Chess hashPosition :: Position -> Word64 hashPosition pos = piece `xor` castling `xor` ep `xor` turn where - piece = foldr xor 0 $ mapMaybe f [A1 .. ] where + piece = foldr xor 0 $ mapMaybe f [A1 .. H8] where f sq = (\(c, p) -> pieceKey (p, c, sq)) <$> pieceAt pos sq castling = foldr (xor . castleKey) 0 $ castlingRights pos ep = 0 -- TODO @@ -19,7 +19,7 @@ White -> turnKey Black -> 0 -pieceKey :: (PieceType, Color, Sq) -> Word64 +pieceKey :: (PieceType, Color, Square) -> Word64 pieceKey = Unboxed.unsafeIndex pieceKeys . index ((Pawn,Black,A1),(King,White,H8)) castleKey :: (Color, Castle) -> Word64 diff --git a/src/Game/Chess/SAN.hs b/src/Game/Chess/SAN.hs --- a/src/Game/Chess/SAN.hs +++ b/src/Game/Chess/SAN.hs @@ -1,8 +1,11 @@ -{-# LANGUAGE PolyKinds, FlexibleInstances, GADTs, ScopedTypeVariables #-} +{-# LANGUAGE FlexibleInstances #-} +{-# LANGUAGE GADTs #-} +{-# LANGUAGE PolyKinds #-} +{-# LANGUAGE ScopedTypeVariables #-} {-| Module : Game.Chess.SAN Description : Standard Algebraic Notation -Copyright : (c) Mario Lang, 2020 +Copyright : (c) Mario Lang, 2021 License : BSD3 Maintainer : mlang@blind.guru Stability : experimental @@ -18,36 +21,44 @@ , varToSAN ) where -import Control.Applicative (Applicative(liftA2)) -import Control.Arrow ((&&&)) -import Data.Bifunctor (first) -import qualified Data.ByteString as Strict (ByteString) -import qualified Data.ByteString.Lazy as Lazy (ByteString) -import Data.Char (chr, ord) -import Data.Functor (($>)) -import Data.List (sortOn) -import Data.List.Extra (chunksOf) -import Data.Maybe (fromJust) -import Data.Ord (Down(..)) -import Data.Proxy ( Proxy(..) ) -import Data.String (IsString(fromString)) -import qualified Data.Text as Strict (Text) -import qualified Data.Text.Lazy as Lazy (Text) -import Data.Traversable (mapAccumL) -import Data.Void (Void) -import Data.Word ( Word8 ) -import Game.Chess.Internal ( Castle(Queenside, Kingside), - Ply, Position(color, moveNumber), Color(Black, White), - PieceType(..), isCapture, pieceAt, - promoteTo, plySource, plyTarget, unpack, doPly, unsafeDoPly, legalPlies, - inCheck, canCastleKingside, canCastleQueenside, - wKscm, wQscm, bKscm, bQscm ) -import Game.Chess.Internal.Square (toIndex, toRF, toCoord) -import Text.Megaparsec ( optional, (<|>), empty, (), chunk, parse, - errorBundlePretty, choice, option, Parsec, - MonadParsec(try, token), - Stream, TraversableStream, VisualStream, - Token, Tokens, chunkLength ) +import Control.Applicative (Applicative (liftA2)) +import Control.Arrow ((&&&)) +import Control.Lens (view) +import Control.Lens.Iso (from) +import Data.Bifunctor (first) +import qualified Data.ByteString as Strict (ByteString) +import qualified Data.ByteString.Lazy as Lazy (ByteString) +import Data.Char (chr, ord) +import Data.Functor (($>)) +import Data.List (sortOn) +import Data.List.Extra (chunksOf) +import Data.Maybe (fromJust) +import Data.MonoTraversable (Element, MonoFoldable (otoList)) +import Data.Ord (Down (..)) +import Data.Proxy (Proxy (..)) +import Data.String (IsString (fromString)) +import qualified Data.Text as Strict (Text) +import qualified Data.Text.Lazy as Lazy (Text) +import Data.Traversable (mapAccumL) +import Data.Void (Void) +import Data.Word (Word8) +import GHC.Stack (HasCallStack) +import Game.Chess.Internal (Castle (Kingside, Queenside), + Color (Black, White), + PieceType (..), Ply, + Position (color, moveNumber), + bKscm, bQscm, canCastleKingside, + canCastleQueenside, doPly, inCheck, + isCapture, legalPlies, pieceAt, + plySource, plyTarget, promoteTo, + unpack, unsafeDoPly, wKscm, wQscm) +import Game.Chess.Internal.Square +import Text.Megaparsec (MonadParsec (token, try), Parsec, + Stream, Token, Tokens, + TraversableStream, VisualStream, + choice, chunk, chunkLength, empty, + errorBundlePretty, option, + optional, parse, (), (<|>)) type Parser s = Parsec Void s @@ -68,9 +79,9 @@ castleMove Queenside | color pos == White = wQscm | otherwise = bQscm -data From = File Int - | Rank Int - | Square Int +data From = F File + | R Rank + | RF Square deriving (Eq, Show) data SANStatus = Check | Checkmate deriving (Eq, Read, Show) @@ -85,10 +96,12 @@ sanPiece :: (Stream s, SANToken (Token s)) => Parser s PieceType sanPiece = token sanPieceToken mempty "piece" -fileP, rankP, squareP :: (Stream s, SANToken (Token s)) => Parser s Int -fileP = token fileToken mempty "file" -rankP = token rankToken mempty "rank" -squareP = liftA2 (flip $ curry toIndex) fileP rankP "square" +fileP :: (Stream s, SANToken (Token s)) => Parser s File +fileP = mkFile <$> token fileToken mempty "file" +rankP :: (Stream s, SANToken (Token s)) => Parser s Rank +rankP = mkRank <$> token rankToken mempty "rank" +squareP :: (Stream s, SANToken (Token s)) => Parser s Square +squareP = liftA2 (flip . curry $ view (from rankFile)) fileP rankP "square" promotionPiece :: (Stream s, SANToken (Token s)) => Parser s PieceType promotionPiece = token promotionPieceToken mempty "Q, R, B, N" @@ -103,7 +116,7 @@ 'R' -> Just Rook 'Q' -> Just Queen 'K' -> Just King - _ -> Nothing + _ -> Nothing fileToken c | c >= 'a' && c <= 'h' = Just $ ord c - ord 'a' | otherwise = Nothing rankToken c | c >= '1' && c <= '8' = Just $ ord c - ord '1' @@ -113,11 +126,11 @@ 'B' -> Just Bishop 'R' -> Just Rook 'Q' -> Just Queen - _ -> Nothing + _ -> Nothing statusToken = \case '+' -> Just Check '#' -> Just Checkmate - _ -> Nothing + _ -> Nothing instance SANToken Word8 where sanPieceToken = \case @@ -126,7 +139,7 @@ 82 -> Just Rook 81 -> Just Queen 75 -> Just King - _ -> Nothing + _ -> Nothing rankToken c | c >= 49 && c <= 56 = Just . fromIntegral $ c - 49 | otherwise = Nothing fileToken c | c >= 97 && c <= 104 = Just . fromIntegral $ c - 97 @@ -136,11 +149,11 @@ 66 -> Just Bishop 82 -> Just Rook 81 -> Just Queen - _ -> Nothing + _ -> Nothing statusToken = \case 43 -> Just Check 35 -> Just Checkmate - _ -> Nothing + _ -> Nothing strictSAN :: forall s. (Stream s, SANToken (Token s), IsString (Tokens s)) => Position -> Parser s Ply @@ -156,12 +169,12 @@ pieceFrom p (plySource -> from) = p == snd (fromJust (pieceAt pos from)) target p ms = coords p ms >>= \m@(plyTarget -> to) -> case p of Pawn | lastRank to -> promoteTo m <$> promotion - _ -> pure m + _ -> pure m coords p ms = choice $ fmap (uncurry (<$) . fmap chunk) $ sortOn (Down . chunkLength (Proxy :: Proxy s) . snd) $ (\m -> (m, sanCoords pos (p,ms) m)) <$> ms promotion = chunk "=" *> promotionPiece - lastRank i = i >= 56 || i <= 7 + lastRank (rank -> r) = r == Rank1 || r == Rank8 checkStatus m | inCheck (color nextPos) nextPos && null (legalPlies nextPos) = chunk "#" $> m @@ -181,12 +194,12 @@ prm <- optional $ optional (chunk "=") *> promotionPiece case possible pc from to prm of [m] -> pure m - [] -> fail "Illegal move" - _ -> fail "Ambiguous move" + [] -> fail "Illegal move" + _ -> fail "Ambiguous move" conv (Nothing, Nothing, cap, to) = (Nothing, cap, to) - conv (Just f, Nothing, cap, to) = (Just (File f), cap, to) - conv (Nothing, Just r, cap, to) = (Just (Rank r), cap, to) - conv (Just f, Just r, cap, to) = (Just (Square (r*8+f)), cap, to) + conv (Just f, Nothing, cap, to) = (Just (F f), cap, to) + conv (Nothing, Just r, cap, to) = (Just (R r), cap, to) + conv (Just f, Just r, cap, to) = (Just (RF (view (from rankFile) (r, f))), cap, to) location = try ((,Nothing,,) <$> (Just <$> fileP) <*> capture <*> squareP) <|> try ((Nothing,,,) <$> (Just <$> rankP) <*> capture <*> squareP) <|> try ((,,,) <$> (Just <$> fileP) <*> (Just <$> rankP) @@ -195,12 +208,12 @@ capture = option False $ chunk "x" $> True ms = legalPlies pos possible pc from to prm = filter (f from) ms where - f (Just (Square sq)) (unpack -> (from', to', prm')) = + f (Just (RF sq)) (unpack -> (from', to', prm')) = pAt from' == pc && from' == sq && to' == to && prm' == prm - f (Just (File ff)) (unpack -> (from', to', prm')) = - pAt from' == pc && from' `mod` 8 == ff && to == to' && prm == prm' - f (Just (Rank fr)) (unpack -> (from', to', prm')) = - pAt from' == pc && from' `div` 8 == fr && to == to' && prm == prm' + f (Just (F ff)) (unpack -> (from', to', prm')) = + pAt from' == pc && file from' == ff && to == to' && prm == prm' + f (Just (R fr)) (unpack -> (from', to', prm')) = + pAt from' == pc && rank from' == fr && to == to' && prm == prm' f Nothing (unpack -> (from', to', prm')) = pAt from' == pc && to == to' && prm == prm' pAt = snd . fromJust . pieceAt pos @@ -209,26 +222,27 @@ => Position -> s -> Either String Ply fromSAN pos = first errorBundlePretty . parse (relaxedSAN pos) "" -toSAN :: IsString s => Position -> Ply -> s +toSAN :: (HasCallStack, IsString s) => Position -> Ply -> s toSAN pos m | m `elem` legalPlies pos = fromString $ unsafeToSAN pos m - | otherwise = error "Game.Chess.toSAN: Illegal move" + | otherwise = error "Game.Chess.toSAN: Illegal move" -varToSAN :: IsString s => Position -> [Ply] -> s -varToSAN _ [] = "" -varToSAN pos plies - | color pos == Black && length plies == 1 - = fromString $ show (moveNumber pos) <> "..." <> toSAN pos (head plies) - | color pos == Black - = fromString $ show (moveNumber pos) <> "..." <> toSAN pos (head plies) <> " " <> fromWhite (doPly pos (head plies)) (tail plies) - | otherwise - = fromString $ fromWhite pos plies - where - fromWhite pos' = unwords . concat - . zipWith f [moveNumber pos' ..] . chunksOf 2 . snd - . mapAccumL (curry (uncurry doPly &&& uncurry toSAN)) pos' +varToSAN :: (MonoFoldable variation, Element variation ~ Ply, IsString string) + => Position -> variation -> string +varToSAN p = fromString . go p . otoList where + go pos [] = "" + go pos plies + | color pos == Black && length plies == 1 + = show (moveNumber pos) <> "..." <> toSAN pos (head plies) + | color pos == Black + = show (moveNumber pos) <> "..." <> toSAN pos (head plies) <> " " <> fromWhite (doPly pos (head plies)) (tail plies) + | otherwise + = fromWhite pos plies + fromWhite pos = unwords . concat + . zipWith f [moveNumber pos ..] . chunksOf 2 . snd + . mapAccumL (curry (uncurry doPly &&& uncurry toSAN)) pos f n (x:xs) = (show n <> "." <> x):xs - f _ [] = [] + f _ [] = [] sanCoords :: IsString s => Position -> (PieceType, [Ply]) -> Ply -> s sanCoords pos (pc,lms) m@(unpack -> (from, to, _)) = @@ -236,28 +250,19 @@ where capture = isCapture pos m source - | pc == Pawn && capture - = [fileChar from] - | pc == Pawn - = [] - | length ms == 1 - = [] - | length (filter fEq ms) == 1 - = [fileChar from] - | length (filter rEq ms) == 1 - = [rankChar from] - | otherwise - = toCoord from + | pc == Pawn && capture = [fileChar from] + | pc == Pawn = [] + | length ms == 1 = [] + | length (filter fEq ms) == 1 = [fileChar from] + | length (filter rEq ms) == 1 = [rankChar from] + | otherwise = toCoord from target - | capture = "x" <> toCoord to + | capture = "x" <> toCoord to | otherwise = toCoord to - ms = filter (isMoveTo to) lms - isMoveTo sq (plyTarget -> to') = sq == to' - fEq (plySource -> from') = from' `mod` 8 == fromFile - rEq (plySource -> from') = from' `div` 8 == fromRank - (fromRank, fromFile) = toRF from - fileChar i = chr $ (i `mod` 8) + ord 'a' - rankChar i = chr $ (i `div` 8) + ord '1' + ms = filter ((to ==) . plyTarget) lms + fEq (file . plySource -> file) = file == fromFile + rEq (rank . plySource -> rank) = rank == fromRank + (fromRank, fromFile) = view rankFile from unsafeToSAN :: Position -> Ply -> String unsafeToSAN pos m@(unpack -> (from, to, promo)) = @@ -290,22 +295,17 @@ Just Bishop -> "B" Just Rook -> "R" Just Queen -> "Q" - _ -> "" - status | inCheck (color nextPos) nextPos && null (legalPlies nextPos) - = "#" - | inCheck (color nextPos) nextPos - = "+" - | otherwise - = "" + _ -> "" + status | inCheck (color nextPos) nextPos && null (legalPlies nextPos) = "#" + | inCheck (color nextPos) nextPos = "+" + | otherwise = "" nextPos = unsafeDoPly pos m ms = filter movesTo $ legalPlies pos movesTo (unpack -> (from', to', _)) = fmap snd (pieceAt pos from') == Just piece && to' == to - fEq (plySource -> from') = from' `mod` 8 == fromFile - rEq (plySource -> from') = from' `div` 8 == fromRank - (fromRank, fromFile) = toRF from - fileChar i = chr $ (i `mod` 8) + ord 'a' - rankChar i = chr $ (i `div` 8) + ord '1' + fEq (file . plySource -> file) = file == fromFile + rEq (rank . plySource -> rank) = rank == fromRank + (fromRank, fromFile) = view rankFile from {-# SPECIALISE relaxedSAN :: Position -> Parser Strict.ByteString Ply #-} {-# SPECIALISE relaxedSAN :: Position -> Parser Lazy.ByteString Ply #-} diff --git a/src/Game/Chess/Tree.hs b/src/Game/Chess/Tree.hs --- a/src/Game/Chess/Tree.hs +++ b/src/Game/Chess/Tree.hs @@ -1,12 +1,8 @@ -module Game.Chess.Tree ( - positionTree, positionForest -, plyTree, plyForest -, pathTree -) where +module Game.Chess.Tree (positionTree, positionForest, plyTree, plyForest) where -import Data.List.NonEmpty (NonEmpty, cons) -import Data.Tree ( Tree(Node), Forest, foldTree ) -import Game.Chess.Internal +import Data.List.NonEmpty (NonEmpty, cons) +import Data.Tree (Forest, Tree (Node), foldTree) +import Game.Chess.Internal positionTree :: Position -> Tree Position positionTree pos = Node pos $ positionForest pos @@ -19,6 +15,3 @@ plyTree :: Position -> Ply -> Tree Ply plyTree pos ply = Node ply . plyForest $ unsafeDoPly pos ply - -pathTree :: Tree a -> Tree (NonEmpty a) -pathTree = foldTree $ \a -> Node (pure a) . (fmap . fmap) (cons a) diff --git a/src/Game/Chess/UCI.hs b/src/Game/Chess/UCI.hs --- a/src/Game/Chess/UCI.hs +++ b/src/Game/Chess/UCI.hs @@ -1,7 +1,7 @@ {-| Module : Game.Chess.UCI Description : Universal Chess Interface -Copyright : (c) Mario Lang, 2020 +Copyright : (c) Mario Lang, 2021 License : BSD3 Maintainer : mlang@blind.guru Stability : experimental @@ -33,49 +33,53 @@ , quit, quit' ) where -import Control.Applicative -import Control.Concurrent -import Control.Concurrent.STM hiding (check) -import Control.Exception -import Control.Monad -import Control.Monad.IO.Class -import Data.Attoparsec.Combinator -import Data.Attoparsec.ByteString.Char8 -import Data.ByteString.Builder -import Data.ByteString.Char8 (ByteString) -import qualified Data.ByteString.Char8 as BS -import Data.Foldable -import Data.Functor -import Data.HashMap.Strict (HashMap) -import qualified Data.HashMap.Strict as HashMap -import Data.IORef -import Data.Ix -import Data.List -import Data.String (IsString(..)) -import Game.Chess -import Numeric.Natural -import System.Exit (ExitCode) -import System.IO -import System.Process -import Time.Rational -import Time.Units +import Control.Applicative +import Control.Concurrent +import Control.Concurrent.STM hiding (check) +import Control.Exception +import Control.Monad +import Control.Monad.IO.Class +import Data.Attoparsec.ByteString.Char8 +import Data.Attoparsec.Combinator +import Data.ByteString.Builder +import Data.ByteString.Char8 (ByteString) +import qualified Data.ByteString.Char8 as BS +import Data.Foldable +import Data.Functor +import Data.HashMap.Strict (HashMap) +import qualified Data.HashMap.Strict as HashMap +import Data.IORef +import Data.Ix +import Data.List +import Data.STRef (modifySTRef, newSTRef, + readSTRef, writeSTRef) +import Data.String (IsString (..)) +import qualified Data.Vector.Unboxed as Unboxed +import qualified Data.Vector.Unboxed.Mutable as Unboxed +import Game.Chess +import Numeric.Natural +import System.Exit (ExitCode) +import System.IO +import System.Process +import Time.Rational +import Time.Units type BestMove = Maybe (Ply, Maybe Ply) data Engine = Engine { - inH :: Handle -, outH :: Handle -, procH :: ProcessHandle -, outputStrLn :: String -> IO () -, infoThread :: Maybe ThreadId -, name :: Maybe ByteString -, author :: Maybe ByteString -, options :: HashMap ByteString Option -, isReady :: MVar () -, isSearching :: IORef Bool -, infoChan :: TChan [Info] + inH :: Handle +, outH :: Handle +, procH :: ProcessHandle +, outputStrLn :: String -> IO () +, infoThread :: Maybe ThreadId +, name :: Maybe ByteString +, author :: Maybe ByteString +, options :: HashMap ByteString Option +, isReady :: MVar () +, isSearching :: IORef Bool +, infoChan :: TChan [Info] , bestMoveChan :: TChan BestMove -, game :: IORef (Position, [Ply]) +, game :: IORef (Position, [Ply]) } -- | Set the starting position of the current game, also clearing any @@ -102,25 +106,25 @@ | BestMove !BestMove deriving (Show) -data Info = PV [Ply] - | Depth Int - | SelDepth Int - | Elapsed (Time Millisecond) - | MultiPV Int - | Score Score (Maybe Bounds) - | Nodes Int - | NPS Int - | TBHits Int - | HashFull Int - | CurrMove Ply - | CurrMoveNumber Int - | String ByteString +data Info = PV !(Unboxed.Vector Ply) + | Depth !Int + | SelDepth !Int + | Elapsed !(Time Millisecond) + | MultiPV !Int + | Score !Score (Maybe Bounds) + | Nodes !Int + | NPS !Int + | TBHits !Int + | HashFull !Int + | CurrMove !Ply + | CurrMoveNumber !Int + | String !ByteString deriving (Eq, Show) data Score = CentiPawns Int | MateIn Int deriving (Eq, Ord, Show) - + data Bounds = UpperBound | LowerBound deriving (Eq, Show) @@ -195,12 +199,11 @@ <|> LowerBound <$ "lowerbound" ) pure $ Score s b - pv = fmap (PV . reverse . snd) $ foldM toPly (pos, []) =<< sepBy mv skipSpace - toPly (pos, xs) s = case fromUCI pos s of - Just m -> pure (unsafeDoPly pos m, m : xs) - Nothing -> fail $ "Failed to parse move " <> s + pv = varToVec pos <$> sepBy mv skipSpace >>= \case + Right v -> pure . PV $ v + Left s -> fail $ "Failed to parse move " <> s currmove = fmap (fromUCI pos) mv >>= \case - Just m -> pure $ CurrMove m + Just m -> pure $ CurrMove m Nothing -> fail "Failed to parse move" mv = BS.unpack . fst <$> match (sq *> sq *> optional (satisfy p)) where @@ -209,7 +212,7 @@ p 'r' = True p 'b' = True p 'n' = True - p _ = False + p _ = False bestmove = do m <- mv ponder <- optional (skipSpace *> kv "ponder" mv) @@ -222,6 +225,23 @@ Nothing -> fail $ "Failed to parse best move " <> m kv k v = k *> skipSpace *> v +varToVec :: Position -> [String] -> Either String (Unboxed.Vector Ply) +varToVec p xs = Unboxed.createT $ do + v <- Unboxed.new $ length xs + i <- newSTRef 0 + pos <- newSTRef p + fmap (fmap (const v) . sequenceA) $ forM xs $ \x -> do + pos' <- readSTRef pos + case fromUCI pos' x of + Just pl -> do + i' <- readSTRef i + Unboxed.write v i' pl + modifySTRef i (+ 1) + writeSTRef pos (unsafeDoPly pos' pl) + pure . Right $ () + Nothing -> do + pure . Left $ x + -- | Start a UCI engine with the given executable name and command line arguments. start :: String -> [String] -> IO (Maybe Engine) start = start' (sec 2) putStrLn @@ -278,7 +298,7 @@ isready e@Engine{isReady} = do send e "isready" takeMVar isReady - + send :: Engine -> Builder -> IO () send Engine{inH, procH} b = do hPutBuilder inH (b <> "\n") @@ -302,7 +322,7 @@ | Infinite -- ^ search until 'stop' gets called deriving (Eq, Show) - + searchmoves :: [Ply] -> SearchParam searchmoves = SearchMoves @@ -400,19 +420,19 @@ if m `notElem` legalPlies pos then throwIO $ IllegalMove m else do atomicModifyIORef' game $ \g -> (fmap (<> [m]) g, ()) sendPosition e - + replacePly :: MonadIO m => Engine -> Ply -> m () replacePly e@Engine{game} pl = liftIO $ do atomicModifyIORef' game $ \g -> (fmap init g, ()) addPly e pl - + sendPosition :: Engine -> IO () sendPosition e@Engine{game} = readIORef game >>= send e . cmd where cmd (p, h) = fold . intersperse " " $ "position" : "fen" : fromString (toFEN p) : line h line [] = [] - line h = "moves" : (fromString . toUCI <$> h) + line h = "moves" : (fromString . toUCI <$> h) -- | Quit the engine. quit :: MonadIO m => Engine -> m (Maybe ExitCode)