Queen's Gambit Accepted: Accelerated Mannheim Variation

The Queen's Gambit Accepted: Accelerated Mannheim Variation is a chess opening classified under ECO code D20 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 3 moves: 1. d4 d5 2. c4 dxc4 3. Qa4+. The resulting position leaves black to move.