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.

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