Chess puzzle (Checkmate)
Moves: 1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. Qc2 dxc4 5. Qxc4 Bf5 6. Nc3 e6 7. Bg5 Nbd7 8.
e4 Bg4 9. e5 h6 10. Bh4 Bxf3 11. gxf3 g5 12. Bg3 Nd5 13. h4 Be7 14. hxg5 Bxg5
15. Ne4 Be7 16. Bd3 Qa5+ 17. Kf1 N7b6 18. Qb3 Qb4 19. Qxb4 Nxb4 20. Ke2 O-O-O
21. Bh4 Bxh4 22. Rxh4 Kc7 23. Nd6 f5 24. Nf7 Nxd3 25. Kxd3 Nd5 26. Nxd8 Rxd8
27. Rxh6 Nf4+ 28. Ke3 Ng2+ 29. Kd3 Nf4+ 30. Kc4 b5+ 31. Kc3 Ne2+ 32. Kd3 Nxd4
33. Kc3 c5 34. f4 Ne2+ 35. Kc2 Nxf4 36. Rg1 Rd5 37. Rg7+ Kc6 38. Rh4 Ne2 39.
Rxa7 Rxe5 40. a4 b4 41. a5 Nd4+ 42. Kd3 Kb5 43. Rhh7 Rd5 44. Rhb7+ Ka4 45. Kc4
Nb3 46. Rh7 Nxa5+ 47. Rxa5+ Kxa5 48. Re7 Re5 49. f4 Re4+ 50. Kxc5 Rxf4 *
Position (FEN): 8/4R3/4p3/k1K2p2/1p3r2/8/1P6/8 w - - 0 51
White to move.
Themes:  Endgame, Rook Endgame Mate in 1 
Puzzle rating: 494
Best move: Ra7#