Chess: Understanding Petroff's Defense

1 e4 e5 2 Nf3 Nf6 3 Nxe5 d6 4 Nf3 Nxe4
5 Nc3 Nc5:



6 d4 Ncd7 7 Bc4 Be7 8 0-0 Nf6
9 Re1 0-0 10 Bg5 Re8 11 Qd3 Nbd7
12 Nd2.



6 Bc4 Be7 7 d4 Ne6 8 d5 Nc5
9 0-0 0-0 10 Re1 Re8 11 b4.



6 Be2 d5 7 0-0 Be7 8 d4 Ne6
9 Re1 0-0 10 Ne5 f6 11 Nf3.



6 a3 d5 7 d4 Ne6 8 Bd3 Be7
9 0-0 0-0.



6 a4 d5 7 d4 Ne6 8 Bd3 c6
9 0-0 Bd6 10 Bf5 0-0
11 Qd3 g6 12 Bg4.



6 Nd5 c6 7 Ne3 d5 8 d4 Ne4
9 Bd3 Bd6 10 0-0 0-0 11 c4 Be6.



6 Qe2+ Ne6 7 d4 d5 8 Bg5 f6
9 Be3 Be7 10 0-0-0 0-0.

Chess: Understanding Petroff's Defense

1 e4 e5 2 Nf3 Nf6 3 Nxe5 d6 4 Nf3 Nxe4
5 Nc3 Ng5 6 Nxg5 Qxg5 7 d4:



7 ... Qf6 8 Nd5 Qe6+ 9 Qe2 Na6
10 Qe3 Qxe3+ 11 Nxe3 c6 12 Be2 Be7
13 0-0 0-0.



7 ... Qd8 8 Bd3 Nc6 9 Be4 Be7
10 0-0 0-0 11 Re1 Re8 12 Qd3.



7 ... Qg6 8 Qf3 c6 9 Bd3 Qe6+
10 Be3 d5 11 0-0-0 Bd6 12 Rhe1.



7 ... Qe7+ 8 Be2 Qd8 9 0-0 Be7
10 Re1 0-0 11 Bd3 Re8 12 Qh5 g6
13 Qf3 Nc6.



7 ... Qg4 8 Qxg4 Bxg4 9 Nd5 Kd8
10 Ne3 Bd7 11 Bc4 Kc8 12 Bxf7 Nc6
13 d5 Nd8 14 Bh5.



7 ... Qf5 8 Bd3 Qe6+ 9 Be3 Be7
10 Qh5 g6 11 Qf3 c6 12 0-0-0 d5
13 Rhe1 Nd7.



7 ... Qa5 8 Bc4 Be7 9 0-0 0-0
10 Nd5 Bd8 11 Qh5 Nc6.

Chess: Understanding Petroff's Defense

1 e4 e5 2 Nf3 Nf6 3 Nxe5 d6 4 Nf3 Nxe4
5 Nc3 f5 6 Qe2 Kf7 7 Nxe4 fxe4 8 Qxe4
8 ... d5 9 Ne5+ Kg8 10 Qf3 Be6 11 d4
11 ... Nd7 12 Bf4 Nxe5 13 dxe5 Qd7
14 O-O-O Qa4 15 Rxd5 Qxa2:



16 c4 c6 17 Rd1 Bc5 18 Bd3 Bd4
19 Bxh7+ Rxh7 20 Rxd4.



16 Rd4 Bc5 17 Qxb7 Rf8 18 Be3 Bxd4
19 Bxd4 Qa1+ 20 Kd2 Rd8.



16 Rd1 Qa1+ 17 Kd2 Bb4+ 18 Ke2 Qxb2
19 Qe4 Rf8 20 Bc1 Qc3.



16 Rd3 Qa1+ 17 Kd2 Qxb2 18 Qe4 Bc5
19 Be3 Bxe3+ 20 Rxe3 Rd8+ 21 Rd3.



16 Bc4 Qxc4 17 Ra5 Bc5 18 Be3 Rf8
19 Qg3 Bxe3+ 20 Qxe3 a6 21 Qg3 Qb4
22 Ra1.



16 b3 Qa1+ 17 Kd2 Bb4+ 18 c3 Qb2+
19 Ke1 Bxc3+ 20 Bd2 Qb1+ 21 Ke2 Qxb3
22 Rd3 Rf8 23 Rxc3.



16 Rd7 Qa1+ 17 Kd2 Bb4+ 18 Ke3 Qe1+
19 Qe2 Bc5+ 20 Kf3 Qxe2+ 21 Bxe2 Bxd7
22 Bc4+.

But Wait!

1 e4 e5 2 Nf3 Nf6 3 Nxe5 d6 4 Nf3 Nxe4
5 Nc3 f5 6 Qe2 Kf7 7 Nxe4 fxe4 8 Qxe4 d5
9 Ne5+ Kg8 10 Be2 Nc6:



11 Nxc6 bxc6 12 Qe3 Bf5 13 d4 Qd7
14 0-0 Re8 15 Qd2 c5.



11 Qf4 Nxe5 12 Qxe5 c6 13 d4 Bd6
14 Qg5 Kf7 15 Qxd8 Rxd8 16 Bd3 g6.



11 Qe3 Nxe5 12 Qxe5 c6 13 d4 Bd6
14 Qg5 Kf7 15 Qxd8 Rxd8 16 Bd3 g6.



11 Bc4 Nxe5 12 Qxd5+ Qxd5 13 Bxd5+ Nf7
14 0-0 c6 15 Bb3 a5 16 a4 Bf5.



11 0-0 Qd6 12 Nc4 dxe4 13 Nxd6 Bxd6
14 Bc4+ Kf8 15 f3 e3 16 dxe3.



11 Bh5 g6 12 Nxc6 bxc6 13 Qe3 gxh5
14 0-0 Qf6 15 Qg3+ Qg6 16 Qe3 h4
17 h3 Bh6 18 Qc3.



11 c3 Qd6 12 Nf7 Kxf7 13 Qf3+ Qf6
14 Qxd5+ Be6 15 Qb5 Rb8 16 d4 a6
17 Qh5+ g6 18 Qf3 Bg7.

Chess: Understanding Petroff's Defense

1 e4 e5 2 Nf3 Nf6 3 Nxe5 d6 4 Nf3 Nxe4
5 Nc3 Qe7 6 Nd5:



6 ... Qd7 7 Qe2 f5 8 d3 c6
9 Nf4 d5 10 dxe4 fxe4
11 Nd4 Qg4 12 Qxg4 Bxg4
13 Nfe6.



6 ... Qd8 7 Qe2 f5 8 d3 c6
9 Bg5 Qa5+ 10 Nc3 d5
11 dxe4 fxe4 12 Bd2 Qa6
13 Qe3 Qb6.



6 ... Nxf2+ 7 Kxf2 Qd8 8 d4 Be6
9 c4 c6 10 Ne3 Qb6 11 d5 cxd5.



6 ... Nc3+ 7 Nxe7 Nxd1 8 Nxc8 Nd7
9 Bd3 Nxf2 10 Kxf2 Rxc8 11 Bf5 g6.



6 ... Nf6+ 7 Nxe7 Bxe7 8 d4 0-0
9 Bd3 Nc6 10 0-0 Nb4 11 Qe1 Nfd5
12 Bxh7+ Kxh7.



6 ... a6 7 Nxe7 Bxe7 8 Bc4 Nf6
9 0-0 0-0 10 Re1 Nc6 11 d4 Re8
12 d5 Nb4.



6 ... Bd7 7 Nxe7 Bxe7 8 d4 0-0
9 Bd3 Nf6 10 0-0 Nc6 11 Re1 Rfe8.

Chess: Understanding Petroff's Defense

1 e4 e5 2 Nf3 Nf6 3 Nxe5 d6 4 Nf3 Nxe4
5 Nc3 d5 6 Qe2 Be7 7 Nxe4 dxe4
8 Qxe4 O-O 9 Bc4:



9 ... Bd6 10 d4 Re8 11 Ne5 Bxe5
12 dxe5 Nc6 13 Bf4 Qh4 14 0-0-0
14 ... Rxe5 15 Rd8+ Qxd8 16 Bxe5
16 ... Nxe5.



9 ... Bf6 10 0-0 Re8 11 Qd5 Qxd5
12 Bxd5 Nd7 13 d4 Nb6 14 Bb3 a5.



9 ... Nd7 10 0-0 Nf6 11 Qe2 Bd6
12 d4 Re8 13 Ne5 Be6 14 Re1.



9 ... Nc6 10 0-0 Bd6 11 Re1 Qf6
12 d3 Bf5 13 Qe3 a5 14 c3 Rad8
15 Qg5 Qxg5 16 Bxg5.



9 ... c5 10 0-0 Nc6 11 Re1 Bd6
12 d3 Qf6 13 a4 Bf5 14 Qe3 Rad8
15 a5 Bg4.



9 ... Qe8 10 0-0 Bd6 11 Qh4 Qd8
12 Qh5 Qf6 13 Re1 Bf5 14 d3 Nd7
15 Nd4 Bg6.



9 ... Bd7.