A04–A40 Flank openings
Colle System
Colle System belongs to the flank openings family and has 3 catalogued lines.
Best for
Start with the main line, then add the variations that appear in your own games.
Study map
Start with one line, then add nearby branches.
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01Colle System: Rhamphorhynchus VariationA04 · 4 movesnew02Colle System: Pterodactyl VariationA40 · 4 movesnew03Colle System: Siroccopteryx VariationA40 · 5 movesnew
Browse all 3 lines
Open the catalogue only when you need a specific branch.
Pterodactyl Variation1 lines
Rhamphorhynchus Variation1 lines
Siroccopteryx Variation1 lines
Mix the variations
Practice changing book replies after you know at least 2 lines.
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