Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. Nc3 d5 3. Bf4 c5 4. e3 a6 5. Nf3 Bg4 6. Be2 Bxf3 7. Bxf3 e6 8. g4
Bd6 9. Bxd6 Qxd6 10. g5 Nfd7 11. Qd2 b5 12. e4 cxd4 13. Qxd4 Nc6 14. Qxg7 O-O-O
15. O-O-O Nde5 16. exd5 exd5 17. Rxd5 Qg6 18. Qxg6 hxg6 19. Rxd8+ Rxd8 20. Bxc6
Nxc6 21. Rd1 Rh8 22. Rd6 Ne5 23. Rxa6 Rxh2 24. f4 Nf3 25. b3 Nd4 26. Rf6 Rxc2+
27. Kd1 Rxc3 28. Rxf7 Rf3 29. Kd2 Ne6 30. Rf6 Nxg5 31. Rxg6 Nh3 32. Rb6 Rf2+
33. Ke3 Rxf4 34. Rxb5 Rf2 35. a4 Rb2 36. Kd3 Nf4+ 37. Kc3 Rb1 38. a5 Ne6 39.
Kb4 Nc7 40. Rc5 Kb7 41. Rh5 Ra1 42. Kc4 Ka6 43. b4 Rc1+ 44. Kb3 Rb1+ 45. Kc3
Nb5+ 46. Kc4 Na3+ 47. Kc3 Rg1 48. Rh6+ Kb5 49. Rb6+ Ka4 50. a6 Rc1+ 51. Kd4 Rc8
52. a7 Nb5+ 53. Kd5 Ra8 54. Kc4 Nxa7 *
Position (FEN): r7/n7/1R6/8/kPK5/8/8/8 w - - 0 55
White to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 826
Best move: Ra6#