Chess puzzle (Checkmate)
Moves: 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nc6 5. Nf3 Nf6 6. Nc3 Bg4 7. Be3 e6 8. h3
Bh5 9. g4 Bg6 10. Qa4 Be7 11. Ne5 Kf8 12. Nxc6 bxc6 13. c5 Qc7 14. Qd1 h5 15.
g5 Ne4 16. Nxe4 Bxe4 17. Rg1 g6 18. f3 Bf5 19. Qd2 Rb8 20. Bf4 Qb7 21. Bxb8
Qxb8 22. h4 Kg7 23. b3 e5 24. Bd3 Bxd3 25. Qxd3 exd4 26. Qxd4+ Kh7 27. Kf2 Bf8
28. Rae1 Bg7 29. Qa4 Qc7 30. Kg2 d4 31. Re4 Rd8 32. Rd1 Rd7 33. Rd3 Rd5 34. Qc4
Qa5 35. b4 Qd8 36. a4 Qd7 37. b5 cxb5 38. axb5 Qf5 39. Re7 Rxc5 40. Qxf7 Rc2+
41. Kg3 Qxf7 42. Rxf7 Kg8 43. Rxa7 Rb2 44. Rxg7+ Kxg7 45. Rxd4 Rxb5 46. Rd7+
Kg8 47. Kf4 Rf5+ 48. Ke3 Kf8 49. f4 Kg8 50. Ke4 Kf8 51. Rd8+ Ke7 52. Rg8 Kf7
53. Ra8 Rb5 54. Ra7+ Ke6 55. Ra6+ Kf7 56. Rf6+ Kg7 57. f5 Rb4+ 58. Kf3 gxf5 59.
Rxf5 Rxh4 60. Rf4 Rh3+ 61. Kg2 Ra3 62. Rf6 Rc3 63. Rh6 Rc2+ 64. Kg3 Rc3+ 65.
Kg2 Ra3 66. Rxh5 Kg6 67. Rh6+ Kg7 68. Rb6 Ra2+ 69. Kf3 Ra3+ 70. Ke4 Ra4+ 71.
Kd5 Ra5+ 72. Kc6 Rxg5 73. Kb7 Re5 74. Ka8 Re8+ 75. Rb8 Re1 76. Rb7+ Kf8 77.
Rb8+ Ke7 78. Rb7+ Kd6 79. Rb6+ Kc7 80. Rb7+ Kc6 81. Rb8 *
Position (FEN): KR6/8/2k5/8/8/8/8/4r3 b - - 17 81
Black to move.
Themes:  Endgame, Rook Endgame Mate in 1 
Puzzle rating: 734
Best move: Ra1#