C42 — Petrov's Defense

Open Games & French (C00–C99)

1. e4 e5 2. Nf3 Nf6

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ECO C42 covers Petrov's Defense and related lines (Petrov's Defense, Petrov's Defense: Italian Variation, Petrov's Defense: Three Knights Game, Petrov's Defense: Damiano Variation). Main line 1. e4 e5 2. Nf3 Nf6 with variations, statistics, and the best responses.

40 lines under C42
Petrov's Defense
1. e4 e5 2. Nf3 Nf6
Petrov's Defense
1. e4 e5 2. Nf3 Nf6 3. Nxe5
Petrov's Defense: Italian Variation
1. e4 e5 2. Nf3 Nf6 3. Bc4
Petrov's Defense: Three Knights Game
1. e4 e5 2. Nf3 Nf6 3. Nc3
Petrov's Defense
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6
Petrov's Defense: Damiano Variation
1. e4 e5 2. Nf3 Nf6 3. Nxe5 Nxe4
Petrov's Defense: Stafford Gambit
1. e4 e5 2. Nf3 Nf6 3. Nxe5 Nc6
Petrov's Defense
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3
Petrov's Defense: Cochrane Gambit
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nxf7
Petrov's Defense: Karklins-Martinovsky Variation
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nd3
Petrov's Defense: Moody Gambit
1. e4 e5 2. Nf3 Nf6 3. Qe2 Nc6 4. d4
Petrov's Defense: Paulsen Attack
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nc4
Petrov's Defense
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4
Petrov's Defense: Damiano Variation, Kholmov Gambit
1. e4 e5 2. Nf3 Nf6 3. Nxe5 Nxe4 4. Qe2 Qe7
Petrov's Defense: Stafford Gambit Accepted
1. e4 e5 2. Nf3 Nf6 3. Nxe5 Nc6 4. Nxc6 dxc6
Petrov's Defense: Classical Attack
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4
Petrov's Defense: Cochrane Gambit, Bishop Check Line
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nxf7 Kxf7 5. Bc4+
Petrov's Defense: Cochrane Gambit, Center Variation
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nxf7 Kxf7 5. d4
Petrov's Defense: Cozio Attack
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. Qe2
Petrov's Defense: French Attack
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d3
Petrov's Defense: Kaufmann Attack
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. c4
Petrov's Defense: Millennium Attack
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. Bd3
Petrov's Defense: Nimzowitsch Attack
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. Nc3
Petrov's Defense: Classical Attack, Closed Variation
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 Nf6
Petrov's Defense: Stafford Gambit Accepted
1. e4 e5 2. Nf3 Nf6 3. Nxe5 Nc6 4. Nxc6 dxc6 5. Nc3 Bc5
Petrov's Defense: Stafford Gambit Accepted
1. e4 e5 2. Nf3 Nf6 3. Nxe5 Nc6 4. Nxc6 dxc6 5. d3 Bc5
Petrov's Defense: Classical Attack, Marshall Variation
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bd6
Petrov's Defense: Classical Attack, Mason-Showalter Variation
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6
Petrov's Defense: Classical Attack, Mason Variation
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. O-O O-O
Petrov's Defense: Classical Attack, Chigorin Variation
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. O-O Nc6 8. Re1
Petrov's Defense: Classical Attack, Jaenisch Variation
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6 7. O-O Be7 8. c4
Petrov's Defense: Classical Attack, Staunton Variation
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bd6 7. O-O O-O 8. c4 c6
Petrov's Defense: Classical Attack, Tarrasch Variation
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bd6 7. O-O O-O 8. c4 Bg4
Petrov's Defense: Classical Attack, Chigorin Variation, Browne Attack
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6 7. O-O Be7 8. c4 Nb4 9. cxd5
Petrov's Defense: Classical Attack, Chigorin Variation, Main Line
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6 7. O-O Be7 8. c4 Nb4 9. Be2
Petrov's Defense: Classical Attack, Marshall Variation, Chinese Gambit
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bd6 7. O-O O-O 8. c4 c6 9. Re1 Bg4
Petrov's Defense: Classical Attack, Berger Variation
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. O-O Nc6 8. Re1 Bg4 9. c3 f5 10. Nbd2
Petrov's Defense: Classical Attack, Krause Variation
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6 7. O-O Be7 8. Re1 Bg4 9. c3 f5 10. c4
Petrov's Defense: Classical Attack, Maróczy Variation
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. O-O Nc6 8. Re1 Bg4 9. c3 f5 10. c4 Bh4
Petrov's Defense: Classical Attack, Marshall Trap
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bd6 7. O-O O-O 8. c4 Bg4 9. cxd5 f5 10. Re1 Bxh2+
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