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Chess Opening Theory/1. d4/1...Nf6/2. c4/2...e6/3. Nc3/3...Bb4/4. Bg5/4...h6

< Chess Opening Theory | 1. d4 | 1...Nf6 | 2. c4 | 2...e6 | 3. Nc3 | 3...Bb4 | 4. Bg5
Nimzo-Indian Defence
a b c d e f g h
8a8 black rookb8 black knightc8 black bishopd8 black queene8 black kingf8 black kingg8 black kingh8 black rook8
7a7 black pawnb7 black pawnc7 black pawnd7 black pawne7 black kingf7 black pawng7 black pawnh7 black king7
6a6 black kingb6 black kingc6 black kingd6 black kinge6 black pawnf6 black knightg6 black kingh6 black pawn6
5a5 black kingb5 black kingc5 black kingd5 black kinge5 black kingf5 black kingg5 white bishoph5 black king5
4a4 black kingb4 black bishopc4 white pawnd4 white pawne4 black kingf4 black kingg4 black kingh4 black king4
3a3 black kingb3 black kingc3 white knightd3 black kinge3 black kingf3 black kingg3 black kingh3 black king3
2a2 white pawnb2 white pawnc2 black kingd2 black kinge2 white pawnf2 white pawng2 white pawnh2 white pawn2
1a1 white rookb1 black kingc1 black kingd1 white queene1 white kingf1 white bishopg1 white knighth1 white rook1
a b c d e f g h
Position in Forsyth-Edwards Notation (FEN)

rnbqk2r/pppp1pp1/4pn1p/6B1/1bPP4/2N5/PP2PPPP/R2QKBNR w

Moves: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Bg5 h6

Nimzo-Indian Defence, Leningrad Variation

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4...h6

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Black drives the bishop back, so as to gain the ability to play ...g5 and break the pin at a later time. 5. Bxf6 Bxc3 6. bxc3 Qxf6 gives up the bishop pair and lessens White's ability to defend the weak c pawns, especially once they become fixed in place with ...c5, so the only good move is 5. Bh4.

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Wikipedia has related information at Nimzo-Indian Defence

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