Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Canal_Attack
Moves: 1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 4. Bxd7+ Nxd7 5. O-O Ngf6 6. Re1 g6 7. d4 cxd4
8. Nxd4 Bg7 9. c3 O-O 10. Bg5 Qb6 11. Qc2 Rac8 12. Nd2 *
Position (FEN): 2r2rk1/pp1nppbp/1q1p1np1/6B1/3NP3/2P5/PPQN1PPP/R3R1K1 b - - 6 12
Black to move.
Themes:  Middlegame  
Puzzle rating: 1477
Best move: Qxd4