D15
Advance System, Slav
1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 c5 Opening moves: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 c5. This position is classified under ECO code D15.
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