Chess puzzle (Checkmate)
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. d4 exd4 6. Qxd4 Qxd4 7. Nxd4 Bd7
8. Be3 c5 9. Ne2 O-O-O 10. Nd2 b6 11. O-O-O Ne7 12. Rhe1 f6 13. Nf4 Re8 14. f3
Nc6 15. Nd5 Ne7 16. Nxe7+ Bxe7 17. Bf4 Be6 18. b3 b5 19. Nf1 c4 20. Ne3 cxb3
21. axb3 Kb7 22. Nd5 Bd8 23. Rd3 c6 24. Nc3 Ba5 25. Red1 Rd8 26. Rxd8 Rxd8 27.
Rxd8 Bxd8 28. Bd6 Bb6 29. Ne2 Be3+ 30. Kb2 c5 31. Bf4 Bxf4 32. Nxf4 Bf7 33. Nd3
Kc6 34. Kc3 a5 35. f4 b4+ 36. Kb2 c4 37. Ne1 Kc5 38. Nf3 Bh5 39. bxc4 Bxf3 40.
gxf3 Kxc4 41. h3 a4 42. h4 g6 43. Ka2 a3 44. Kb1 Kd4 45. Ka2 Kc3 46. e5 fxe5
47. fxe5 Kxc2 48. e6 b3+ 49. Kxa3 b2 50. e7 b1=Q 51. e8=Q *
Position (FEN): 4Q3/7p/6p1/8/7P/K4P2/2k5/1q6 b - - 0 51
Black to move.
Themes:  Endgame, Queen Endgame Mate in 1 
Puzzle rating: 991
Best move: Qb3#