Chess puzzle (Checkmate)
Opening: Sicilian_Defense, Sicilian_Defense_Najdorf_Variation
Moves: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Be7 8. Qf3
O-O 9. O-O-O e5 10. Nf5 Bxf5 11. exf5 Nc6 12. g4 Qc7 13. Bxf6 gxf6 14. Nd5 Qa5
15. Kb1 Rfe8 16. g5 Nb4 17. gxf6 Qxa2+ 18. Kc1 Nxd5 19. Qg4+ Kh8 *
Position (FEN): r3r2k/1p2bp1p/p2p1P2/3npP2/5PQ1/8/qPP4P/2KR1B1R w - - 2 20
White to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1453
Best move: Qg7#