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Colle System

3 variations · Flank openings · main line 1.d4 g6 2.Nf3 Bg7 3.e3 c5 4.Bd3 Qa5+

A40 Colle System: Pterodactyl Variation 1.d4 g6 2.Nf3 Bg7 3.e3 c5 4.Bd3 Qa5+
A04 Colle System: Rhamphorhynchus Variation 1.Nf3 c5 2.e3 g6 3.d4 Bg7 4.dxc5 Qa5+
A40 Colle System: Siroccopteryx Variation 1.d4 g6 2.Nf3 Bg7 3.e3 c5 4.Bd3 cxd4 5.Nxd4 Qa5+