Colle System: Siroccopteryx 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 cxd4 5. Nxd4 Qa5+. White opens with 1. d4 (the queen's pawn) and Black answers 1... g6. After 10 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... cxd4 – Black captures on d4 with the c-pawn
5. Nxd4 – White takes on d4 with the knight
5... Qa5+ – Black plays the queen to a5, giving check
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