Chess puzzle (Checkmate)
Opening: Sicilian_Defense, Sicilian_Defense_Modern_Variations
Moves: 1. e4 c5 2. Nf3 d6 3. Bc4 h6 4. Nc3 a6 5. d4 cxd4 6. Qxd4 Nc6 7. Qd3 e5 8. O-O
Nf6 9. Re1 Be7 10. Nd5 Nxd5 11. exd5 Na7 12. Nd2 b5 13. Bb3 Qb6 14. Ne4 O-O 15.
Be3 Qb7 16. c3 Bf5 17. Bc2 Nc8 18. g4 Bxg4 19. Nf6+ Bxf6 *
Position (FEN): r1n2rk1/1q3pp1/p2p1b1p/1p1Pp3/6b1/2PQB3/PPB2P1P/R3R1K1 w - - 0 20
White to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 491
Best move: Qh7#