Queen's Gambit Declined: Chigorin Defense, Exchange Variation, Costa's Line

The Queen's Gambit Declined: Chigorin Defense, Exchange Variation, Costa's Line is a chess opening classified under ECO code D07 in the Closed & Semi-Closed Games family, arising from 1.d4 d5, including the Queen's Gambit, Slav Defense, and related systems. It is reached after 8 moves: 1. d4 d5 2. c4 Nc6 3. cxd5 Qxd5 4. e3 e5 5. Nc3 Bb4 6. Bd2 Bxc3 7. Bxc3 exd4 8. Ne2. The resulting position leaves black to move.