Chess puzzle (Checkmate)
Moves: 1. Nf3 d5 2. c4 e6 3. e3 Nf6 4. Nc3 c6 5. b3 Bd6 6. Bb2 O-O 7. h3 Qe7 8. Qc2
Nbd7 9. g4 b6 10. g5 Ne8 11. d4 Bb7 12. O-O-O e5 13. cxd5 cxd5 14. dxe5 Nxe5
15. Nd4 g6 16. h4 Nc7 17. Bh3 Ne6 18. Bxe6 fxe6 19. f4 Ng4 20. Rhe1 e5 21. fxe5
Bxe5 22. Kb1 Rae8 23. Qg2 Nf2 24. Rd2 Ne4 25. Nxe4 dxe4 26. h5 Rf7 27. hxg6
hxg6 28. Rf2 Rxf2 29. Qxf2 Ba6 30. a3 Bd3+ 31. Ka2 Rf8 32. Qh4 Qh7 33. Qg4 Bxd4
34. Bxd4 Rf2+ 35. Ka1 Qe7 36. Qc8+ Kf7 37. Bb2 Qxg5 38. Rh1 Rf1+ 39. Rxf1+ Bxf1
40. Qh8 Bd3 41. Ka2 a5 42. Qg7+ Ke6 43. Qd4 Qd5 44. Qxb6+ Kf5 45. Qf6+ Kg4 46.
Qxg6+ Kf3 47. a4 Bc2 48. Qb6 Qd1 49. Ka3 Qd3 50. Qf6+ Ke2 51. Qd4 *
Position (FEN): 8/8/8/p7/P2Qp3/KP1qP3/1Bb1k3/8 b - - 8 51
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 965
Best move: Qxb3#