D37
Queen's Gambit Declined
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3
The Queen's Gambit Declined is a chess opening classified under ECO code D37. It is reached after the moves 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3.
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