Chess: Understanding Petroff's Defense

1 e4 e5 2 Nf3 Nf6 3 Nxe5 d6 4 Nf3 Nxe4
5 c4 Be7 6 d4 O-O 7 Bd3 Ng5 8 Nxg5 Bxg5
9 Qh5 Re8+ 10 Kd1 h6 11 Bxg5 Qxg5
12 Qxg5 hxg5 Line



1 e4 e5 2 Nf3 Nf6:



3 Nxe5



3 d4
3 Nc3
3 d3
3 Bc4
3 Qe2
3 a3
3 Bb5
3 Be2

3 ... d6



3 ... Nxe4
3 ... Qe7
3 ... d5
3 ... Nc6
3 ... Bb4
3 ... Be7

4 Nf3



4 Nc4
4 Nxf7
4 Nd3

4 ... Nxe4



4 ... Nc6
4 ... Be7
4 ... c6
4 ... a6
4 ... Qe7

5 c4



5 d4
5 Qe2
5 Nc3
5 d3
5 Bd3
5 Bb5+
5 Bc4
5 Be2

5 ... Be7



5 ... Nc6
5 ... c6
5 ... d5
5 ... Bg4
5 ... Be6
5 ... g6

6 d4



6 Nc3
6 Be2
6 d3
6 Qc2
6 Bd3
6 a3

6 ... O-O



6 ... d5
6 ... Bg4
6 ... Nf6
6 ... Nc6
6 ... Bf5

7 Bd3



7 Be2
7 Nc3
7 a3
7 Qc2
7 Be3
7 Qb3

7 ... Ng5



7 ... d5
7 ... Nf6
7 ... f5
7 ... Re8
7 ... Bh4

8 Nxg5



8 Nc3
8 Ng1
8 Nfd2
8 Be3
8 Bxg5
8 h3
8 Nbd2

8 ... Bxg5



9 Qh5



9 O-O
9 Nc3
9 Be3
9 Bd2
9 Kf1

9 ... Re8+



9 ... h6
9 ... Qe7+
9 ... Bh6

10 Kd1



10 Be3

10 ... h6



10 ... Bxc1
10 ... Bh6
10 ... Bf6

11 Bxg5



11 Na3
11 d5
11 Nc3
11 Nd2
11 Kc2

11 ... Qxg5



11 ... hxg5

12 Qxg5



12 ... hxg5



13 Nc3 Bd7 14 h4 g4 15 Kd2 Nc6
16 Nd5 Rac8 17 Kc3 Ne7 18 Ne3 f5
19 g3 c6 20 h5 b5 21 Kd2 a5.



13 Na3 c6 14 Kd2 Be6 15 h4 g4
16 Rae1 Na6 17 Nc2 d5 18 c5.



13 Kd2 Nc6 14 Kc3 a5 15 Nd2 Nb4
16 Be4 f5 17 a3 Na2+ 18 Rxa2 fxe4.



13 Kc2 a5 14 Kc3 Nc6 15 Nd2 Nb4
16 Be4 f5 17 a3 Na2+ 18 Rxa2 fxe4.



13 d5 Nd7 14 Nc3 Ne5 15 Re1 Bd7
16 Kd2 Ng4 17 Rxe8+ Rxe8 18 Ne4 f5
19 Ng3.



13 Re1 Rxe1+ 14 Kxe1 Nc6 15 d5 Ne5
16 Ke2 Bg4+ 17 Kd2 Nxd3 18 Kxd3 Re8
19 Nc3 Bf5+ 20 Kd2.



13 h4 Nc6 14 hxg5 Nxd4 15 Nc3 Be6
16 Kd2 Rad8 17 Rh4 Nf5 18 Bxf5 Bxf5
19 Rah1.