# Chess Opening Theory/1. d4/1...d5/2. c4/2...c6/3. Nf3/3...Nf6/4. Nc3/4...a6/5. c5

< Chess Opening Theory‎ | 1. d4‎ | 1...d5‎ | 2. c4‎ | 2...c6‎ | 3. Nf3‎ | 3...Nf6‎ | 4. Nc3‎ | 4...a6
Slav Defence
 a b c d e f g h 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 a b c d e f g h
Position in Forsyth-Edwards Notation (FEN)
Moves: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 a6 5. c5

# a6 Slav

White plays 5. c5 (the Advance System) to control the weak b6 square and forestall any ...dxc4 or ...b5 ideas. If he can make this space advantage permanent, he will have a very comfortable game, so Black needs to start planning a pawn break on either b6 or e5. To support this, the main move is 5...Nbd7, developing the queen's knight to its best available square and preparing whichever break Black chooses. The main alternatives are 5...Bf5, developing the bishop before it gets blocked in by ...Nbd7, and 5...g6, preparing a fianchetto. 5...Bg4 is also played occasionally, with the idea of pressuring the e5 square indirectly, but there is no reason White cannot simply occupy it at once with 6. Ne5.

## Theory table

1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 a6 5. c5

5 6
a6 Slav ...
Nbd7
Bf4
Nh5
+/=
...
Bf5
Bf4
Nbd7
+/=
...
g6
Bf4
Bg7
+/=
...
Bg4
Ne5
Bf5
+/−