Queen's Gambit Declined: Baltic Defense, Argentinian Gambit

The Queen's Gambit Declined: Baltic Defense, Argentinian Gambit is a chess opening classified under ECO code D06 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 5 moves: 1. d4 d5 2. c4 Bf5 3. cxd5 Bxb1 4. Qa4+ c6 5. dxc6 Nxc6. The resulting position leaves white to move.