ECO B27

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

21 named opening lines are classified under ECO code B27.

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