Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Modern_Variations
Moves: 1. e4 c5 2. Nf3 d6 3. Bc4 Nf6 4. Nc3 e6 5. a3 a6 6. d3 Be7 7. O-O O-O 8. h3
Nbd7 9. Bg5 h6 10. Bh4 b5 11. Ba2 Bb7 12. Qd2 Re8 13. Rfe1 Nf8 14. Qf4 Ng6 15.
Qg3 Nxh4 16. Nxh4 Nh7 17. Nf5 *
Position (FEN): r2qr1k1/1b2bppn/p2pp2p/1pp2N2/4P3/P1NP2QP/BPP2PP1/R3R1K1 b - - 2 17
Black to move.
Themes:  Middlegame  
Puzzle rating: 1242
Best move: exf5