ECO B27: Sicilian Defense, Pterodactyl Defense & more

ECO B27 is part of volume B — Semi-Open Games. The Lichess chess-openings dataset files 23 named lines under it, from 3 different openings. The shortest is Sicilian Defense: 1. e4 c5 2. Nf3.

That position has come up in 210,455,240 Lichess games between players rated 1600 to 2500: White won 47.8%, 5.0% were drawn and Black won 47.2%.

Opening	Moves	Plies
Sicilian Defense	`1. e4 c5 2. Nf3`	3
Sicilian Defense: Brussels Gambit	`1. e4 c5 2. Nf3 f5`	4
Sicilian Defense: Bücker Variation	`1. e4 c5 2. Nf3 h6`	4
Sicilian Defense: Hyperaccelerated Dragon	`1. e4 c5 2. Nf3 g6`	4
Sicilian Defense: Jalalabad Variation	`1. e4 c5 2. Nf3 e5`	4
Sicilian Defense: Katalimov Variation	`1. e4 c5 2. Nf3 b6`	4
Sicilian Defense: Mongoose Variation	`1. e4 c5 2. Nf3 Qa5`	4
Sicilian Defense: Polish Gambit	`1. e4 c5 2. Nf3 b5`	4
Sicilian Defense: Quinteros Variation	`1. e4 c5 2. Nf3 Qc7`	4
Sicilian Defense: Hyperaccelerated Dragon	`1. e4 c5 2. Nf3 g6 3. d4`	5
Sicilian Defense: Acton Extension	`1. e4 c5 2. Nf3 g6 3. c4 Bh6`	6
Sicilian Defense: Double-Dutch Gambit	`1. e4 c5 2. Nf3 f5 3. exf5 Nh6`	6
Sicilian Defense: Frederico Variation	`1. e4 c5 2. Nf3 g6 3. d4 f5`	6
Sicilian Defense: Hyperaccelerated Pterodactyl	`1. e4 c5 2. Nf3 g6 3. d4 Bg7`	6
Modern Defense: Pterodactyl Variation	`1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5`	8
Pterodactyl Defense: Western, Pterodactyl	`1. e4 c5 2. Nf3 g6 3. c3 Bg7 4. d4 Qa5`	8
Pterodactyl Defense: Western, Rhamphorhynchus	`1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. dxc5 Qa5+`	8
Pterodactyl Defense: Sicilian, Anhanguera	`1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be3`	9
Pterodactyl Defense: Sicilian, Benoni Gambit	`1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. d5`	9
Pterodactyl Defense: Sicilian, Rhamphorhynchus	`1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. dxc5 Qa5+ 5. Nc3`	9
Pterodactyl Defense: Sicilian, Unpin	`1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Bd2`	9
Pterodactyl Defense: Sicilian, Pteranodon	`1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. dxc5 Qa5+ 5. Nc3 Bxc3+ 6. bxc3`	11
Sicilian Defense: Hyperaccelerated Pterodactyl, Exchange Variation	`1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. dxc5 Qa5+ 5. Nc3 Bxc3+ 6. bxc3 Qxc3+`	12