Queen's Gambit Declined: Cambridge Springs Defense, Argentine Variation

The Queen's Gambit Declined: Cambridge Springs Defense, Argentine Variation is a chess opening classified under ECO code D52 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 9 moves: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 c6 6. Nf3 Qa5 7. Nd2 Bb4 8. Qc2 O-O 9. Bh4. The resulting position leaves black to move.