Colle System
The Colle System (ECO A04–A40) is a chess opening that begins 1. d4 g6 2. Nf3 Bg7 3. e3 c5 4. Bd3 Qa5+.
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The main line
The Colle System is reached by 1. d4 g6 2. Nf3 Bg7 3. e3 c5 4. Bd3 Qa5+ (ECO A40). It's one of 3 named lines under this opening in the book.
Named variations (2)
- Rhamphorhynchus Variation —
1. Nf3 c5 2. e3 g6 3. d4 Bg7 4. dxc5 Qa5+(A04) - Siroccopteryx Variation —
1. d4 g6 2. Nf3 Bg7 3. e3 c5 4. Bd3 cxd4 5. Nxd4 Qa5+(A40)
Analyze the Colle System
Play through this opening on the free analysis board, or review one of your own gamesto see how accurately you handled it — every move classified, with the engine's best line on each mistake.
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