Colle System: Pterodactyl Variation

1.d4 g6 2.Nf3 Bg7 3.e3 c5 4.Bd3 Qa5+

ECO A40

The Colle System: Pterodactyl Variation is a chess opening reached after 1.d4 g6 2.Nf3 Bg7 3.e3 c5 4.Bd3 Qa5+, catalogued under code A40 in the Encyclopaedia of Chess Openings (ECO).

The defining move Qa5+ is chosen by Black on move 4.

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• Catalan Opening
• King's Indian Defense with ...e5

Every chess term used here is defined in the chess terms glossary. Browse all opening courses or the full ECO code index.