ECO C42

ECO C00–C99 — Open Games and the French Defense: 1.e4 e6 and 1.e4 e5, from the Italian and Ruy Lopez to the King's Gambit.

34 named opening lines are classified under ECO code C42.

• Petrov's Defense — 1.e4 e5 2.Nf3 Nf6
• Petrov's Defense: Classical Attack — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4
• 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, 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, 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, Closed Variation — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 Nf6
• 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, 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, 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+
• 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, 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, 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, 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, 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, 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: Cochrane Gambit — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nxf7
• 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: Damiano Variation — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nxe4
• Petrov's Defense: Damiano Variation, Kholmov Gambit — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nxe4 4.Qe2 Qe7
• Petrov's Defense: French Attack — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d3
• Petrov's Defense: Italian Variation — 1.e4 e5 2.Nf3 Nf6 3.Bc4
• Petrov's Defense: Karklins-Martinovsky Variation — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nd3
• 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: Moody Gambit — 1.e4 e5 2.Nf3 Nf6 3.Qe2 Nc6 4.d4
• Petrov's Defense: Nimzowitsch Attack — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.Nc3
• Petrov's Defense: Paulsen Attack — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nc4
• Petrov's Defense: Stafford Gambit — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nc6
• Petrov's Defense: Stafford Gambit Accepted — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nc6 4.Nxc6 dxc6
• Petrov's Defense: Three Knights Game — 1.e4 e5 2.Nf3 Nf6 3.Nc3