Queen's Gambit Declined: Semmering Variation

The Queen's Gambit Declined: Semmering Variation is a chess opening classified under ECO code D30 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 6 moves: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 e6 5. Nbd2 Nbd7 6. Bd3 c5. The resulting position leaves white to move.