Chess puzzle (Checkmate)
Moves: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e5 7. Nf3 h6 8. Bc4
Qc7 9. Bb3 Be7 10. O-O Be6 11. Qe2 O-O 12. Rfd1 Nbd7 13. Rd3 Bxb3 14. axb3 Nc5
15. Bxc5 dxc5 16. Nd5 Nxd5 17. Rxd5 Bf6 18. Rad1 Rfd8 19. Qc4 Rxd5 20. Rxd5 Rd8
21. g3 Rxd5 22. Qxd5 Qa5 23. Nxe5 Bxe5 24. Qxe5 g6 25. Qd5 b6 26. Kg2 Qb5 27.
e5 Qe8 28. Qd6 a5 29. f4 Qa8+ 30. Kf2 Qh1 31. Qxb6 Qxh2+ 32. Kf3 Qxc2 33. Qxa5
Qd3+ 34. Kg4 h5+ 35. Kh4 Qf3 36. Qd8+ Kh7 37. Kg5 Qg4+ 38. Kf6 Qe6+ 39. Kg5
Qf5+ 40. Kh4 *
Position (FEN): 3Q4/5p1k/6p1/2p1Pq1p/5P1K/1P4P1/1P6/8 b - - 11 40
Black to move.
Themes:  Endgame, Queen Endgame Mate in 1 
Puzzle rating: 868
Best move: Qg4#