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Chess Opening Theory/1. d4/1...d5/2. c4/2...c6/3. Nf3/3...Nf6/4. Nc3/4...a6

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Slav Defence
a b c d e f g h
8a8 black rookb8 black knightc8 black bishopd8 black queene8 black kingf8 black bishopg8 black kingh8 black rook8
7a7 black kingb7 black pawnc7 black kingd7 black kinge7 black pawnf7 black pawng7 black pawnh7 black pawn7
6a6 black pawnb6 black kingc6 black pawnd6 black kinge6 black kingf6 black knightg6 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 white pawnd4 white pawne4 black kingf4 black kingg4 black kingh4 black king4
3a3 black kingb3 black kingc3 white knightd3 black kinge3 black kingf3 white knightg3 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 white bishopd1 white queene1 white kingf1 white bishopg1 black kingh1 white rook1
a b c d e f g h
Position in Forsyth-Edwards Notation (FEN)

rnbqkb1r/1p2pppp/p1p2n2/3p4/2PP4/2N2N2/PP2PPPP/R1BQKB1R w

Moves: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 a6

a6 Slav

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The move 4...a6 introduces the a6 (or Chebanenko or Chameleon) Slav. Though it seems a small move, it prepares ideas of ...b5 (either to attack White's c4 pawn or to shore up Black's after ...dxc4) and eases the problems of developing Black's light-squared bishop, as now Qb3 can be met with ...Ra7.[1] The weakening of the b6 square, however, invites White to simply push - 5. c5 is the most common response, but White can also play 5. e3, solidifying his d pawn and adding his light-squared bishop to the fight, while accepting 5...b5. Less common are 5. a4, preventing ...b5, and 5. cxd5, releasing the central tension but leaving Black to show what purpose ...a6 now serves.

Theory table

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1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 a6

5 6
a6 Slav c5
Nbd7		 Bf4
Nh5		 +/=
c5
Bf5		 Bf4
Nbd7		 +/=
e3
b5		 b3
Bg4		 =
a4
e6		 Bg5
Nbd7		 =
cxd5
cxd5		 Bf4
Nc6		 =

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References

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  1. ↑ Schandorff, Lars (2009). Playing the Queen's Gambit. Glasgow: Quality Chess UK LLP. p. 164. ISBN 978-1-906552-18-3.
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