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Chigorin Defense, Modern Gambit
Queen's Gambit Declined1. d4 d5 2. c4 Nc6 3. Nc3 dxc4 4. Nf3 Nf6
Also known as QGD: Chigorin, 3.Nc3 dxc4 4.Nf3 Nf6, Queen's Gambit Refused: Chigorin Defense, Modern Gambit, Modern Gambit, Chigorin Defense.