Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Staunton-Cochrane_Variation
Moves: 1. e4 c5 2. c4 Nc6 3. Nc3 e6 4. g3 Nf6 5. Bg2 Be7 6. Nf3 O-O 7. O-O d5 8. e5
Nd7 9. cxd5 exd5 10. Nxd5 Ndxe5 11. Nxe5 Nxe5 12. Re1 Bd6 13. b3 Bg4 14. f3 Be6
15. Nf4 Bd7 16. Bb2 Re8 17. Nh5 Qg5 *
Position (FEN): r3r1k1/pp1b1ppp/3b4/2p1n1qN/8/1P3PP1/PB1P2BP/R2QR1K1 w - - 7 18
White to move.
Themes:  Middlegame  
Puzzle rating: 1180
Best move: f4