Chess puzzle (Checkmate)
Moves: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 Qc7 6. Bd3 Bb4 7. Bd2 Nf6 8. f3
d5 9. exd5 Bxc3 10. Bxc3 Nxd5 11. Bd2 b5 12. O-O Bb7 13. Kh1 Nd7 14. Rc1 Rc8
15. c4 bxc4 16. Rxc4 Qb6 17. Rxc8+ Bxc8 18. Nb3 O-O 19. Be4 Ne3 20. Bxe3 Qxe3
21. Re1 Qb6 22. Qd3 Nf6 23. Qd4 Qxd4 24. Nxd4 Nxe4 25. Rxe4 Bb7 26. Re1 Rd8 27.
Nb3 h6 28. h3 Bd5 29. Re3 Rb8 30. Kg1 Bxb3 31. Rxb3 Rxb3 32. axb3 f5 33. Kf2
Kf7 34. Ke3 Kf6 35. Kd4 e5+ 36. Kc5 g5 37. b4 e4 38. Kd4 exf3 39. gxf3 h5 40.
b5 axb5 41. b4 Ke6 42. Kc5 g4 43. fxg4 fxg4 44. hxg4 hxg4 45. Kxb5 g3 46. Ka6
g2 47. b5 g1=Q 48. b6 Qa1+ 49. Kb7 Qb2 50. Kc7 Qc3+ 51. Kb8 Qb4 52. b7 Kd7 53.
Ka8 Kc7 54. b8=Q+ *
Position (FEN): KQ6/2k5/8/8/1q6/8/8/8 b - - 0 54
Black to move.
Themes:  Endgame, Queen Endgame Mate in 1 
Puzzle rating: 670
Best move: Qxb8#