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ECO B00: Nimzowitsch Defense, Owen Defense & more

ECO B00 is part of volume B — Semi-Open Games. The Lichess chess-openings dataset files 83 named lines under it, from 17 different openings. The shortest is King's Pawn Game: 1. e4.

That position has come up in 1,527,871,757 Lichess games between players rated 1600 to 2500: White won 49.0%, 4.7% were drawn and Black won 46.4%.

OpeningMovesPlies
King's Pawn Game 1. e4 1
Barnes Defense 1. e4 f6 2
Borg Defense 1. e4 g5 2
Carr Defense 1. e4 h6 2
Duras Gambit 1. e4 f5 2
Goldsmith Defense 1. e4 h5 2
Hippopotamus Defense 1. e4 Nh6 2
Lemming Defense 1. e4 Na6 2
Nimzowitsch Defense 1. e4 Nc6 2
Owen Defense 1. e4 b6 2
Pirc Defense 1. e4 d6 2
St. George Defense 1. e4 a6 2
Ware Defense 1. e4 a5 2
Nimzowitsch Defense 1. e4 Nc6 2. d4 3
Nimzowitsch Defense: Declined Variation 1. e4 Nc6 2. Nf3 3
Nimzowitsch Defense: Pseudo-Spanish Variation 1. e4 Nc6 2. Bb5 3
Nimzowitsch Defense: Wheeler Gambit 1. e4 Nc6 2. b4 3
Pirc Defense 1. e4 d6 2. d4 3
Rat Defense: Harmonist 1. e4 d6 2. f4 3
Rat Defense: Petruccioli Attack 1. e4 d6 2. h4 3
Rat Defense: Spike Attack 1. e4 d6 2. g4 3
Borg Defense: Borg Gambit 1. e4 g5 2. d4 Bg7 4
Borg Defense: Zilbermints Gambit 1. e4 g5 2. d4 e5 4
Carr Defense: Zilbermints Gambit 1. e4 h6 2. d4 e5 4
Fried Fox Defense 1. e4 f6 2. d4 Kf7 4
Goldsmith Defense: Picklepuss Defense 1. e4 h5 2. d4 Nf6 4
Nimzowitsch Defense: Colorado Countergambit 1. e4 Nc6 2. Nf3 f5 4
Nimzowitsch Defense: Franco-Nimzowitsch Variation 1. e4 Nc6 2. Nf3 e6 4
Nimzowitsch Defense: French Connection 1. e4 Nc6 2. Nc3 e6 4
Nimzowitsch Defense: Kennedy Variation 1. e4 Nc6 2. d4 e5 4
Nimzowitsch Defense: Mikenas Variation 1. e4 Nc6 2. d4 d6 4
Nimzowitsch Defense: Neo-Mongoloid Defense 1. e4 Nc6 2. d4 f6 4
Nimzowitsch Defense: Pirc Connection 1. e4 Nc6 2. Nc3 g6 4
Nimzowitsch Defense: Scandinavian Variation 1. e4 Nc6 2. d4 d5 4
Nimzowitsch Defense: Williams Variation 1. e4 Nc6 2. Nf3 d6 4
Nimzowitsch Defense: Woodchuck Variation 1. e4 Nc6 2. d4 a6 4
Owen Defense: Guatemala Defense 1. e4 b6 2. d4 Ba6 4
Pirc Defense 1. e4 d6 2. d4 Nf6 4
Rat Defense: Antal Defense 1. e4 d6 2. d4 Nd7 4
St. George Defense: Zilbermints Gambit 1. e4 a6 2. d4 e5 4
Ware Defense: Snagglepuss Defense 1. e4 a5 2. d4 Nc6 4
Lion Defense: Lion's Jaw 1. e4 d6 2. d4 Nf6 3. f3 5
Nimzowitsch Defense: Colorado Countergambit Accepted 1. e4 Nc6 2. Nf3 f5 3. exf5 5
Nimzowitsch Defense: Hornung Gambit 1. e4 Nc6 2. d4 d5 3. Be3 5
Nimzowitsch Defense: Kennedy Variation, Linksspringer Variation 1. e4 Nc6 2. d4 e5 3. d5 5
Nimzowitsch Defense: Scandinavian Variation, Advance Variation 1. e4 Nc6 2. d4 d5 3. e5 5
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation 1. e4 Nc6 2. d4 d5 3. Nc3 5
Owen Defense: Naselwaus Gambit 1. e4 b6 2. d4 Bb7 3. Bg5 5
Owen Defense: Smith Gambit 1. e4 b6 2. d4 Bb7 3. Nf3 5
Pirc Defense: Roscher Gambit 1. e4 d6 2. d4 Nf6 3. Nf3 5
Borg Defense: Troon Gambit 1. e4 g5 2. d4 h6 3. h4 g4 6
Hippopotamus Defense 1. e4 Nh6 2. d4 g6 3. c4 f6 6
Nimzowitsch Defense: Breyer Variation 1. e4 Nc6 2. Nc3 Nf6 3. d4 e5 6
Nimzowitsch Defense: El Columpio Defense 1. e4 Nc6 2. Nf3 Nf6 3. e5 Ng4 6
Nimzowitsch Defense: Kennedy Variation, Bielefelder Gambit 1. e4 Nc6 2. d4 e5 3. dxe5 Bc5 6
Nimzowitsch Defense: Kennedy Variation, de Smet Gambit 1. e4 Nc6 2. d4 e5 3. dxe5 d6 6
Nimzowitsch Defense: Kennedy Variation, Hammer Gambit 1. e4 Nc6 2. d4 e5 3. dxe5 f6 6
Nimzowitsch Defense: Kennedy Variation, Herford Gambit 1. e4 Nc6 2. d4 e5 3. dxe5 Qh4 6
Nimzowitsch Defense: Scandinavian Variation, Aachen Gambit 1. e4 Nc6 2. d4 d5 3. exd5 Nb4 6
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation 1. e4 Nc6 2. d4 d5 3. Nc3 dxe4 6
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Brandics Gambit 1. e4 Nc6 2. d4 d5 3. Nc3 a6 6
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Erben Gambit 1. e4 Nc6 2. d4 d5 3. Nc3 g6 6
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Heinola-Deppe Gambit 1. e4 Nc6 2. d4 d5 3. Nc3 e5 6
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Vehre Variation 1. e4 Nc6 2. d4 d5 3. Nc3 Nf6 6
Nimzowitsch Defense: Scandinavian Variation, Exchange Variation 1. e4 Nc6 2. d4 d5 3. exd5 Qxd5 6
Owen Defense: Hekili-Loa Gambit 1. e4 b6 2. d4 c5 3. dxc5 Nc6 6
Owen Defense: Unicorn Variation 1. e4 f6 2. d4 b6 3. c4 Bb7 6
Owen Defense: Wind Gambit 1. e4 b6 2. d4 Bb7 3. f3 e5 6
Rat Defense: Fuller Gambit 1. e4 d6 2. f4 d5 3. exd5 Nf6 6
Nimzowitsch Defense: Kennedy Variation, Keres Attack 1. e4 Nc6 2. d4 e5 3. dxe5 Nxe5 4. Nc3 7
Nimzowitsch Defense: Kennedy Variation, Paulsen Attack 1. e4 Nc6 2. d4 e5 3. dxe5 Nxe5 4. Nf3 7
Nimzowitsch Defense: Scandinavian Variation, Exchange Variation, Marshall Gambit 1. e4 Nc6 2. d4 d5 3. exd5 Qxd5 4. Nc3 7
Van Geet Opening: Berlin Gambit 1. e4 Nc6 2. d4 d5 3. Nc3 dxe4 4. d5 7
Nimzowitsch Defense: Kennedy Variation, Main Line 1. e4 Nc6 2. d4 e5 3. dxe5 Nxe5 4. f4 Ng6 8
Nimzowitsch Defense: Kennedy Variation, Riemann Defense 1. e4 Nc6 2. d4 e5 3. dxe5 Nxe5 4. f4 Nc6 8
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Nimzowitsch Gambit 1. e4 Nc6 2. d4 d5 3. Nc3 dxe4 4. d5 Ne5 8
St. George Defense: Polish Variation 1. e4 a6 2. d4 b5 3. Nf3 Bb7 4. Bd3 e6 8
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Richter Gambit 1. e4 Nc6 2. d4 d5 3. Nc3 dxe4 4. d5 Nb8 5. f3 9
Owen Defense: Matovinsky Gambit 1. e4 b6 2. d4 Bb7 3. Bd3 f5 4. exf5 Bxg2 5. Qh5+ g6 10
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 11
Nimzowitsch Defense: El Columpio Defense, Exchange Variation 1. e4 Nc6 2. Nf3 Nf6 3. e5 Ng4 4. d4 d6 5. h3 Nh6 6. exd6 11
Nimzowitsch Defense: El Columpio Defense, Pin Variation 1. e4 Nc6 2. Nf3 Nf6 3. e5 Ng4 4. d4 d6 5. h3 Nh6 6. Bb5 11
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 12

https://chesscodex.org/eco/B00