ECO B00

ECO B00–B99 — Semi-Open Games other than the French: 1.e4 answered by the Sicilian, Caro-Kann, Scandinavian, Alekhine, Pirc and more.

77 named opening lines are classified under ECO code B00.

• Barnes Defense — 1.e4 f6
• Borg Defense — 1.e4 g5
• Borg Defense: Troon Gambit — 1.e4 g5 2.d4 h6 3.h4 g4
• Borg Defense: Zilbermints Gambit — 1.e4 g5 2.d4 e5
• Carr Defense — 1.e4 h6
• Carr Defense: Zilbermints Gambit — 1.e4 h6 2.d4 e5
• Duras Gambit — 1.e4 f5
• Fried Fox Defense — 1.e4 f6 2.d4 Kf7
• Goldsmith Defense — 1.e4 h5
• Goldsmith Defense: Picklepuss Defense — 1.e4 h5 2.d4 Nf6
• Hippopotamus Defense — 1.e4 Nh6
• King's Pawn Game — 1.e4
• Lemming Defense — 1.e4 Na6
• Lion Defense: Lion's Jaw — 1.e4 d6 2.d4 Nf6 3.f3
• Nimzowitsch Defense — 1.e4 Nc6
• Nimzowitsch Defense: Breyer Variation — 1.e4 Nc6 2.Nc3 Nf6 3.d4 e5
• Nimzowitsch Defense: Colorado Countergambit — 1.e4 Nc6 2.Nf3 f5
• Nimzowitsch Defense: Colorado Countergambit Accepted — 1.e4 Nc6 2.Nf3 f5 3.exf5
• Nimzowitsch Defense: Declined Variation — 1.e4 Nc6 2.Nf3
• Nimzowitsch Defense: El Columpio Defense — 1.e4 Nc6 2.Nf3 Nf6 3.e5 Ng4
• Nimzowitsch Defense: El Columpio Defense, El Columpio Gambit — 1.e4 Nc6 2.Nf3 Nf6 3.e5 Ng4 4.d4 d6 5.h3 Nh6 6.e6
• Nimzowitsch Defense: El Columpio Defense, Exchange Variation — 1.e4 Nc6 2.Nf3 Nf6 3.e5 Ng4 4.d4 d6 5.h3 Nh6 6.exd6
• Nimzowitsch Defense: El Columpio Defense, Pin Variation — 1.e4 Nc6 2.Nf3 Nf6 3.e5 Ng4 4.d4 d6 5.h3 Nh6 6.Bb5
• Nimzowitsch Defense: Franco-Nimzowitsch Variation — 1.e4 Nc6 2.Nf3 e6
• Nimzowitsch Defense: French Connection — 1.e4 Nc6 2.Nc3 e6
• Nimzowitsch Defense: Hornung Gambit — 1.e4 Nc6 2.d4 d5 3.Be3
• Nimzowitsch Defense: Kennedy Variation — 1.e4 Nc6 2.d4 e5
• Nimzowitsch Defense: Kennedy Variation, Bielefelder Gambit — 1.e4 Nc6 2.d4 e5 3.dxe5 Bc5
• Nimzowitsch Defense: Kennedy Variation, Hammer Gambit — 1.e4 Nc6 2.d4 e5 3.dxe5 f6
• Nimzowitsch Defense: Kennedy Variation, Herford Gambit — 1.e4 Nc6 2.d4 e5 3.dxe5 Qh4
• Nimzowitsch Defense: Kennedy Variation, Keres Attack — 1.e4 Nc6 2.d4 e5 3.dxe5 Nxe5 4.Nc3
• Nimzowitsch Defense: Kennedy Variation, Linksspringer Variation — 1.e4 Nc6 2.d4 e5 3.d5
• Nimzowitsch Defense: Kennedy Variation, Main Line — 1.e4 Nc6 2.d4 e5 3.dxe5 Nxe5 4.f4 Ng6
• Nimzowitsch Defense: Kennedy Variation, Paulsen Attack — 1.e4 Nc6 2.d4 e5 3.dxe5 Nxe5 4.Nf3
• Nimzowitsch Defense: Kennedy Variation, Riemann Defense — 1.e4 Nc6 2.d4 e5 3.dxe5 Nxe5 4.f4 Nc6
• Nimzowitsch Defense: Kennedy Variation, de Smet Gambit — 1.e4 Nc6 2.d4 e5 3.dxe5 d6
• Nimzowitsch Defense: Mikenas Variation — 1.e4 Nc6 2.d4 d6
• Nimzowitsch Defense: Neo-Mongoloid Defense — 1.e4 Nc6 2.d4 f6
• Nimzowitsch Defense: Pirc Connection — 1.e4 Nc6 2.Nc3 g6
• Nimzowitsch Defense: Pseudo-Spanish Variation — 1.e4 Nc6 2.Bb5
• Nimzowitsch Defense: Scandinavian Variation — 1.e4 Nc6 2.d4 d5
• Nimzowitsch Defense: Scandinavian Variation, Aachen Gambit — 1.e4 Nc6 2.d4 d5 3.exd5 Nb4
• Nimzowitsch Defense: Scandinavian Variation, Advance Variation — 1.e4 Nc6 2.d4 d5 3.e5
• Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation — 1.e4 Nc6 2.d4 d5 3.Nc3
• Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Brandics Gambit — 1.e4 Nc6 2.d4 d5 3.Nc3 a6
• Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Erben Gambit — 1.e4 Nc6 2.d4 d5 3.Nc3 g6
• Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Heinola-Deppe Gambit — 1.e4 Nc6 2.d4 d5 3.Nc3 e5
• Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Nimzowitsch Gambit — 1.e4 Nc6 2.d4 d5 3.Nc3 dxe4 4.d5 Ne5
• Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Richter Gambit — 1.e4 Nc6 2.d4 d5 3.Nc3 dxe4 4.d5 Nb8 5.f3
• Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Vehre Variation — 1.e4 Nc6 2.d4 d5 3.Nc3 Nf6
• Nimzowitsch Defense: Scandinavian Variation, Exchange Variation — 1.e4 Nc6 2.d4 d5 3.exd5 Qxd5
• Nimzowitsch Defense: Scandinavian Variation, Exchange Variation, Marshall Gambit — 1.e4 Nc6 2.d4 d5 3.exd5 Qxd5 4.Nc3
• Nimzowitsch Defense: Wheeler Gambit — 1.e4 Nc6 2.b4
• Nimzowitsch Defense: Williams Variation — 1.e4 Nc6 2.Nf3 d6
• Nimzowitsch Defense: Woodchuck Variation — 1.e4 Nc6 2.d4 a6
• Owen Defense — 1.e4 b6
• Owen Defense: Guatemala Defense — 1.e4 b6 2.d4 Ba6
• Owen Defense: Hekili-Loa Gambit — 1.e4 b6 2.d4 c5 3.dxc5 Nc6
• Owen Defense: Matovinsky Gambit — 1.e4 b6 2.d4 Bb7 3.Bd3 f5 4.exf5 Bxg2 5.Qh5+ g6
• Owen Defense: Naselwaus Gambit — 1.e4 b6 2.d4 Bb7 3.Bg5
• Owen Defense: Smith Gambit — 1.e4 b6 2.d4 Bb7 3.Nf3
• Owen Defense: Unicorn Variation — 1.e4 f6 2.d4 b6 3.c4 Bb7
• Owen Defense: Wind Gambit — 1.e4 b6 2.d4 Bb7 3.f3 e5
• Pirc Defense — 1.e4 d6
• Pirc Defense: Roscher Gambit — 1.e4 d6 2.d4 Nf6 3.Nf3
• Rat Defense: Antal Defense — 1.e4 d6 2.d4 Nd7
• Rat Defense: Fuller Gambit — 1.e4 d6 2.f4 d5 3.exd5 Nf6
• Rat Defense: Harmonist — 1.e4 d6 2.f4
• Rat Defense: Petruccioli Attack — 1.e4 d6 2.h4
• Rat Defense: Spike Attack — 1.e4 d6 2.g4
• St. George Defense — 1.e4 a6
• St. George Defense: Polish Variation — 1.e4 a6 2.d4 b5 3.Nf3 Bb7 4.Bd3 e6
• St. George Defense: San Jorge Variation — 1.e4 a6 2.d4 b5 3.Nf3 Bb7 4.Bd3 d6 5.O-O g6 6.c3 Bg7
• St. George Defense: Zilbermints Gambit — 1.e4 a6 2.d4 e5
• Van Geet Opening: Berlin Gambit — 1.e4 Nc6 2.d4 d5 3.Nc3 dxe4 4.d5
• Ware Defense — 1.e4 a5
• Ware Defense: Snagglepuss Defense — 1.e4 a5 2.d4 Nc6