A40
Colle System: Siroccopteryx Variation
1. d4 g6 2. Nf3 Bg7 3. e3 c5 4. Bd3 cxd4 5. Nxd4 Qa5+
The Colle System: Siroccopteryx Variation is a chess opening classified under ECO code A40. It is reached after the moves 1. d4 g6 2. Nf3 Bg7 3. e3 c5 4. Bd3 cxd4 5. Nxd4 Qa5+.
It belongs to the Colle System family — one of many ways the line can branch. Understanding the parent system’s plans is the fastest way to play this variation well.
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