Chess: Understanding Petroff's Defense

1 e4 e5 2 Nf3 Nf6 3 Bc4 Nxe4 4 Nc3 Nc6
5 Nxe4 d5 6 Bd3 dxe4 7 Bxe4 Bd6 8 d4
8 ... exd4 9 Bxc6+ bxc6 10 Qxd4 O-O
11 O-O Line



1 e4 e5 2 Nf3 Nf6:



3 Bc4



3 Nxe5
3 d4
3 Nc3
3 d3
3 Qe2
3 a3
3 Bb5
3 Be2
3 h3

3 ... Nxe4



3 ... Nc6
3 ... Bc5
3 ... Bb4
3 ... b5
3 ... Qe7
3 ... d6

4 Nc3



4 d4
4 Qe2
4 Nxe5
4 d3
4 Qe2
4 O-O
4 Bb3

4 ... Nc6



4 ... Nxc3
4 ... Nd6
4 ... d5
4 ... Be7
4 ... Bb4

5 Nxe4



5 O-O
5 Bxf7+
5 Bb5
5 Qe2
5 Bd5
5 h3
5 Bb3
5 a4

5 ... d5



6 Bd3



6 Bb5
6 d4
6 Bxd5
6 Qe2
6 Nc3
6 Ng3

6 ... dxe4



6 ... f5
6 ... Bg4
6 ... Nb4
6 ... Be6
6 ... Bb4
6 ... Bd7

7 Bxe4



7 ... Bd6



7 ... Qf6
7 ... Bc5
7 ... Bg4
7 ... Ne7
7 ... Qd6
7 ... Nb4
7 ... Be6

8 d4



8 O-O
8 Bxc6+
8 c3
8 Qe2
8 a3
8 d3

8 ... exd4



8 ... Nxd4
8 ... Bg4
8 ... Qd7
8 ... O-O
8 ... Bd7
8 ... Qe7

9 Bxc6+



9 O-O
9 Nxd4
9 Qd3
9 Bg5
9 a3
9 h3

9 ... bxc6



10 Qxd4



10 O-O
10 Qe2+
10 Nxd4
10 Kf1
10 Qd3

10 ... O-O



10 ... Qe7+
10 ...Qf6
10 ... Bf8
10 ... Kf8
10 ... f6
10 ... Ba6

11 O-O



11 Be3
11 Qa4
11 a3
11 Qc3
11 h3
11 Bd2
11 Bg5