Queen's Gambit Declined: Semi-Tarrasch Defense, Krause Variation

The Queen's Gambit Declined: Semi-Tarrasch Defense, Krause Variation is a chess opening classified under ECO code D50 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 8 moves: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 c5 5. Nf3 cxd4 6. Nxd4 e5 7. Ndb5 a6 8. Qa4. The resulting position leaves black to move.