Chess puzzle (Checkmate)
Moves: 1. Nf3 d5 2. g3 c6 3. Bg2 Bg4 4. c4 e6 5. cxd5 Bxf3 6. Bxf3 cxd5 7. O-O Nc6 8.
d3 Nf6 9. Nc3 Be7 10. e4 dxe4 11. dxe4 O-O 12. Be3 Ne5 13. Be2 Bb4 14. f4 Bxc3
15. bxc3 Qxd1 16. Rfxd1 Neg4 17. Bd4 h5 18. Bf3 Rfd8 19. h3 Nh6 20. Bxf6 gxf6
21. Bxh5 Kf8 22. Rab1 b6 23. Kf2 f5 24. e5 Ke7 25. Ke3 Rac8 26. Rxd8 Kxd8 27.
Rd1+ Ke7 28. Rd3 Rc5 29. g4 fxg4 30. hxg4 Ra5 31. Rd2 Ra3 32. Rc2 b5 33. Kd4
Ra4+ 34. Ke3 a5 35. Rb2 b4 36. cxb4 axb4 37. Rf2 Ra3+ 38. Kd4 b3 39. axb3 Rxb3
40. f5 Nxg4 41. f6+ Kf8 42. Ra2 Kg8 43. Bxg4 Rb4+ 44. Kc5 Rxg4 45. Kd6 Kh7 46.
Ke7 Kg6 47. Ra8 Rb4 48. Rg8+ Kf5 49. Kxf7 Rb7+ 50. Kf8 Kxe5 51. f7 Kf6 52. Rg1
*
Position (FEN): 5K2/1r3P2/4pk2/8/8/8/8/6R1 b - - 2 52
Black to move.
Themes:  Endgame, Rook Endgame Mate in 1 
Puzzle rating: 1623
Best move: Rb8#