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Chess Opening Theory/1. e4/1...Nc6/2. d4/2...d5/3. Nc3/3...a6

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Nimzowitsch Defence
a b c d e f g h
8a8 black rookb8 black kingc8 black bishopd8 black queene8 black kingf8 black bishopg8 black knighth8 black rook8
7a7 black kingb7 black pawnc7 black pawnd7 black kinge7 black pawnf7 black pawng7 black pawnh7 black pawn7
6a6 black pawnb6 black kingc6 black knightd6 black kinge6 black kingf6 black kingg6 black kingh6 black king6
5a5 black kingb5 black kingc5 black kingd5 black pawne5 black kingf5 black kingg5 black kingh5 black king5
4a4 black kingb4 black kingc4 black kingd4 white pawne4 white pawnf4 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 white pawnd2 black kinge2 black kingf2 white pawng2 white pawnh2 white pawn2
1a1 white rookb1 black kingc1 white bishopd1 white queene1 white kingf1 white bishopg1 white knighth1 white rook1
a b c d e f g h
Position in Forsyth-Edwards Notation (FEN)

r1bqkbnr/1pp1pppp/p1n5/3p4/3PP3/2N5/PPP2PPP/R1BQKBNR w

Moves: 1. e4 Nc6 2. d4 d5 3. Nc3 a6

Nimzowitsch Defence

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It seems that after 3...a6!? Black has given away his pawn for nothing, but the pawn can be regained by 4...Nb4, 5...Nf6 and then Nbxd5. Having a pawn on a6 is constructive because it denies White's bishop the ability to check on b5 which would be bad for black as white has a pawn on d5 for the time being. White's main option here is to accept black's counter gambit with:

4. exd5

Theory table

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For explanation of theory tables, see theory table and for notation, see algebraic notation..

'1. e4 Nc6 2. d4 d5 3. Nc3 a6'

4
exd5
...		 ∞

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References

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Wikipedia has related information at Nimzowitsch Defence

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