D05 white d4 Curated
Colle System
Opening Moves
1. d4 d5 2. Nf3 Nf6 3. e3
About this Opening
A solid system building a pawn triangle on d4-e3-c3. Easy to learn with clear plans.
Learn this Opening
Study the Colle System with spaced repetition. Our algorithm schedules reviews at optimal intervals so you never forget the key moves.