Chess puzzle (Advantage)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Albin_Countergambit
Moves: 1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3 Nc6 5. Bg5 Bb4+ 6. Nbd2 f6 7. exf6 Nxf6 8.
a3 Bxd2+ 9. Qxd2 O-O 10. Bxf6 Rxf6 11. e3 Bg4 12. Nxd4 *
Position (FEN): r2q2k1/ppp3pp/2n2r2/8/2PN2b1/P3P3/1P1Q1PPP/R3KB1R b KQ - 0 12
Black to move.
Themes:  Middlegame  
Puzzle rating: 1123
Best move: Nxd4