Chess puzzle (Checkmate)
Moves: 1. e4 c5 2. Nf3 a6 3. d4 cxd4 4. Nxd4 Nf6 5. Bd3 e5 6. Nb3 d5 7. exd5 Qxd5 8.
O-O Nc6 9. Bg5 Be7 10. Bxf6 Bxf6 11. Nc3 Qd8 12. Re1 O-O 13. a3 Be6 14. Nc5 Bc8
15. Be4 Rb8 16. Qxd8 Rxd8 17. b4 Nd4 18. Rad1 b6 19. Nb3 Bg4 20. Nxd4 exd4 21.
Ne2 g6 22. h3 Be6 23. Bd3 Rbc8 24. Nf4 Bc4 25. Bxc4 Rxc4 26. Re2 Kg7 27. Nd3
Rdc8 28. Rdd2 Rc3 29. Nf4 Rxa3 30. Nd5 Rd8 31. Nxf6 Kxf6 32. Re4 d3 33. cxd3
Raxd3 34. Rf4+ Kg7 35. Ra2 R8d4 36. Rxd4 Rxd4 37. Rxa6 Rxb4 38. h4 h5 39. g3
Rb2 40. Kg2 b5 41. Kf3 b4 42. Rb6 b3 43. Ke3 Rb1 44. Rb7 b2 45. Kf4 Kf6 46.
Rb6+ Ke7 47. Kg5 Kd7 48. Kf6 Rf1 49. Rb7+ Ke8 50. Rxb2 Kf8 *
Position (FEN): 5k2/5p2/5Kp1/7p/7P/6P1/1R3P2/5r2 w - - 1 51
White to move.
Themes:  Endgame, Rook Endgame Mate in 1 
Puzzle rating: 400
Best move: Rb8#