D04
Colle System
1. d4 d5 2. Nf3 Nf6 3. e3
The Colle System is a chess opening classified under ECO code D04. It is reached after the moves 1. d4 d5 2. Nf3 Nf6 3. e3.
Learn its typical plans and pawn structures rather than memorizing moves — that’s what holds up over the board.
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