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. c4 c5 2. Nf3 Nf6 3. Nc3 Nc6 4. g3 d5 5. d4 e6. The resulting position leaves white to move.