Colle System: Pterodactyl Variation is a chess opening with the ECO code A40, part of the Colle System family. It goes 1. d4 g6 2. Nf3 Bg7 3. e3 c5 4. Bd3 Qa5+. White opens with 1. d4 (the queen's pawn) and Black answers 1... g6. After 8 moves it is White to move. The lesson on the board explains every move of the line and lets you play it yourself; it is free.
The moves
1. d4 – White plays the pawn to d4
1... g6 – Black plays the pawn to g6
2. Nf3 – White plays the knight to f3
2... Bg7 – Black plays the bishop to g7
3. e3 – White plays the pawn to e3
3... c5 – Black plays the pawn to c5
4. Bd3 – White plays the bishop to d3
4... Qa5+ – Black plays the queen to a5, giving check
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