Colle System
3 variations · A04 to A40
The idea
A quiet buildup, e4 later.
White builds up quietly with e3 and the bishop on d3, and later breaks open the center with e4.
Pterodactyl Variation
A40 · 4 moves
Colle System: Pterodactyl Variation
Variations 3
Names and moves from lichess-org/chess-openings (CC0).