Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Other_variations
Moves: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nc6 5. Nxc6 bxc6 6. Bc4 Nf6 7. Qf3 e6 8.
Nc3 Be7 9. O-O Bb7 10. Rd1 a5 11. e5 Nd5 12. Qg3 Nxc3 13. bxc3 Rg8 14. Qh3 h6
15. Qh5 d5 16. Bd3 Qb6 17. Be3 c5 18. Rab1 Qc7 19. f4 Rd8 *
Position (FEN): 3rk1r1/1bq1bpp1/4p2p/p1ppP2Q/5P2/2PBB3/P1P3PP/1R1R2K1 w - - 1 20
White to move.
Themes:  Middlegame  
Puzzle rating: 2100
Best move: f5