Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Classical_Variation
Moves: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 d6 5. Nc3 Nf6 6. Bb5 Bd7 7. Nxc6 Bxc6 8.
Bxc6+ bxc6 9. O-O g6 10. f3 Bg7 11. Rb1 O-O 12. Bd2 Rb8 13. b3 Nd7 14. Ne2 a5
15. Qc1 Nc5 16. Bh6 a4 17. Bxg7 Kxg7 18. Nd4 axb3 19. Nxc6 *
Position (FEN): 1r1q1r2/4ppkp/2Np2p1/2n5/4P3/1p3P2/P1P3PP/1RQ2RK1 b - - 0 19
Black to move.
Themes:  Middlegame  
Puzzle rating: 1601
Best move: Qb6