Chess puzzle (Checkmate)
Moves: 1. f4 d6 2. Nf3 Nc6 3. g3 e5 4. fxe5 Nxe5 5. Bg2 Nxf3+ 6. exf3 Nf6 7. O-O d5 8.
d4 Bd6 9. c3 O-O 10. f4 Bf5 11. Nd2 Re8 12. Nf3 Be4 13. Qb3 Rb8 14. Bd2 c6 15.
Rae1 Qb6 16. Bc1 Qxb3 17. axb3 a6 18. Ne5 Bxg2 19. Kxg2 Ne4 20. c4 f6 21. Nd7
Rbd8 22. Nb6 Bc7 23. Na4 Kf7 24. c5 Ba5 25. Rd1 h5 26. Rd3 Kg6 27. Nc3 Bxc3 28.
bxc3 Kf5 29. h3 Rd7 30. Kf3 Rde7 31. c4 g5 32. g4+ hxg4+ 33. hxg4+ Ke6 34. Rh1
Kd7 35. Rh6 Rf8 36. f5 Ree8 37. Rh7+ Kc8 38. cxd5 cxd5 39. Rd1 Rh8 40. Rdh1
Rxh7 41. Rxh7 Rd8 42. Be3 Rd7 43. Rh8+ Kc7 44. Re8 Kc6 45. Re6+ Kb5 46. Rb6+
Ka5 47. Ke2 Rh7 48. Bd2+ Nxd2 49. Kxd2 Rh4 50. Rxb7 Rxg4 51. Kc3 Rg3+ 52. Kb2
Rd3 53. Ka3 g4 54. c6 g3 55. c7 Rc3 56. c8=Q Rxc8 *
Position (FEN): 2r5/1R6/p4p2/k2p1P2/3P4/KP4p1/8/8 w - - 0 57
White to move.
Themes:  Endgame, Rook Endgame Mate in 1 
Puzzle rating: 817
Best move: b4#