Queen's Gambit Declined: Semi-Tarrasch Defense

The Queen's Gambit Declined: Semi-Tarrasch Defense is a chess opening classified under ECO code D41 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 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 5. cxd5. The resulting position leaves black to move.