Chess Opening Theory/1. d4/1...d5/2. c4/2...c6/3. Nc3/3...dxc4/4. e3/4...b5/5. Nxb5/5...cxb5/6. Qf3/6...Nc6/7. Qxc6/7...Bd7/8. Qf3/8...e5/9. dxe5

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) r2qkbnr/p2b1ppp/8/1p2P3/2p5/4PQ2/PP3PPP/R1B1KBNR b
Moves: 1. d4 d5 2. c4 c6 3. Nc3 dxc4 4. e3 b5 5. Nxb5 cxb5 6. Qf3 Nc6 7. Qxc6 Bd7 8. Qf3 e5 9. dxe5

9.dxe5?

This move accepts the sacrifice, but this is another mistake, allowing Black a crushing attack. In a situation like this, it is more important to develop and stop Bb4+ with a move like Bd2. This also opens the d-file, this amplifying the power of Black's attack. The best move to attack is Bb4+.

Theory table

9	10	11
... Bb4+	Ke2 Nh6	Qf4 Bf5	-/+