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.

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