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ECO B20: Sicilian Defense

ECO B20 is part of volume B — Semi-Open Games. The Lichess chess-openings dataset files 27 named lines under it. The shortest is Sicilian Defense: 1. e4 c5.

That position has come up in 366,614,827 Lichess games between players rated 1600 to 2500: White won 47.8%, 4.8% were drawn and Black won 47.4%.

OpeningMovesPlies
Sicilian Defense 1. e4 c5 2
Sicilian Defense: Amazon Attack 1. e4 c5 2. Qg4 3
Sicilian Defense: Bowdler Attack 1. e4 c5 2. Bc4 3
Sicilian Defense: Brick Variation 1. e4 c5 2. Nh3 3
Sicilian Defense: Czerniak Attack 1. e4 c5 2. b3 3
Sicilian Defense: Grob Variation 1. e4 c5 2. g4 3
Sicilian Defense: Keres Variation 1. e4 c5 2. Ne2 3
Sicilian Defense: King David's Opening 1. e4 c5 2. Ke2 3
Sicilian Defense: Kronberger Variation 1. e4 c5 2. Na3 3
Sicilian Defense: Lasker-Dunne Attack 1. e4 c5 2. g3 3
Sicilian Defense: Mengarini Variation 1. e4 c5 2. a3 3
Sicilian Defense: Myers Attack, with a4 1. e4 c5 2. a4 3
Sicilian Defense: Myers Attack, with h4 1. e4 c5 2. h4 3
Sicilian Defense: Staunton-Cochrane Variation 1. e4 c5 2. c4 3
Sicilian Defense: Wing Gambit 1. e4 c5 2. b4 3
Sicilian Defense: Czerniak Attack, Queen Fianchetto Variation 1. e4 c5 2. b3 b6 4
Sicilian Defense: Euwe Attack, Prins Gambit 1. e4 c5 2. b3 d5 3. Bb2 5
Sicilian Defense: Wing Gambit, Abrahams Variation 1. e4 c5 2. b4 cxb4 3. Bb2 5
Sicilian Defense: Wing Gambit, Marshall Variation 1. e4 c5 2. b4 cxb4 3. a3 5
Sicilian Defense: Wing Gambit, Santasiere Variation 1. e4 c5 2. b4 cxb4 3. c4 5
Sicilian Defense: Wing Gambit, Carlsbad Variation 1. e4 c5 2. b4 cxb4 3. a3 bxa3 6
Sicilian Defense: Big Clamp Formation 1. e4 c5 2. d3 Nc6 3. c3 d6 4. f4 7
Sicilian Defense: Kronberger Variation, Nemeth Gambit 1. e4 c5 2. Na3 Nc6 3. d4 cxd4 4. Bc4 7
Sicilian Defense: Gloria Variation 1. e4 c5 2. c4 d6 3. Nc3 Nc6 4. g3 h5 8
Sicilian Defense: Wing Gambit, Marienbad Variation 1. e4 c5 2. b4 cxb4 3. a3 d5 4. exd5 Qxd5 5. Bb2 9
Sicilian Defense: Wing Gambit, Nanu Gambit 1. e4 c5 2. b4 cxb4 3. a3 d5 4. exd5 Qxd5 5. Nf3 e5 6. c4 Qe6 7. Bd3 13
Sicilian Defense: Wing Gambit, Romanian Defense 1. e4 c5 2. b4 cxb4 3. a3 d5 4. exd5 Qxd5 5. Nf3 e5 6. Bb2 Nc6 7. c4 Qe6 14

https://chesscodex.org/eco/B20