Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Delayed_Alapin
Moves: 1. e4 c5 2. Nf3 d6 3. c3 Nd7 4. d4 Qc7 5. Bb5 a6 6. Ba4 b5 7. Bc2 Ngf6 8. O-O
g6 9. Bf4 Bg7 10. Re1 O-O 11. Nbd2 Bb7 12. a4 Rac8 13. axb5 axb5 14. Ra7 Qb6
15. Ra1 Qc6 16. e5 dxe5 17. dxe5 Nh5 18. Bg5 Nxe5 19. Be4 Nxf3+ *
Position (FEN): 2r2rk1/1b2ppbp/2q3p1/1pp3Bn/4B3/2P2n2/1P1N1PPP/R2QR1K1 w - - 0 20
White to move.
Themes:  Middlegame  
Puzzle rating: 2005
Best move: Qxf3