Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Nyezhmetdinov-Rossolimo_Attack
Moves: 1. e4 c5 2. Nf3 Nc6 3. Bb5 Nf6 4. Bxc6 dxc6 5. Nc3 Bg4 6. d3 h6 7. h3 Bh5 8.
Be3 e6 9. Qe2 Be7 10. g4 Bg6 11. Ne5 Nd7 12. Nxg6 fxg6 13. O-O Qc7 14. f4 O-O-O
15. Kg2 Rdf8 16. a4 g5 17. a5 *
Position (FEN): 2k2r1r/ppqnb1p1/2p1p2p/P1p3p1/4PPP1/2NPB2P/1PP1Q1K1/R4R2 b - - 0 17
Black to move.
Themes:  Middlegame  
Puzzle rating: 1279
Best move: gxf4