Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 b6 6. Nf3 O-O 7. Bg5 d6 8. e4
Nbd7 9. Bd3 h6 10. Bh4 Bb7 11. e5 Bxf3 12. Qxf3 dxe5 13. Bxf6 Qxf6 14. Qe4 g6
15. d5 Nc5 16. Qe3 Nxd3+ 17. Qxd3 Rad8 18. O-O exd5 19. cxd5 c6 20. c4 b5 21.
cxb5 Rxd5 22. Qe3 cxb5 23. Qxa7 Kg7 24. Rab1 Rc8 25. Qb7 Qc6 26. Qxc6 Rxc6 27.
Rfd1 Rxd1+ 28. Rxd1 Ra6 29. Ra1 b4 30. a4 f5 31. f3 Kf6 32. Kf2 Ke6 33. Ke3 Kd5
34. Kd3 e4+ 35. fxe4+ fxe4+ 36. Ke3 b3 37. Kd2 b2 38. Rb1 Rxa4 39. Rxb2 Rd4+
40. Ke3 Rd3+ 41. Ke2 Ke5 42. Rb5+ Kf4 43. Rb6 Re3+ 44. Kf2 Ra3 45. Rxg6 Ra2+
46. Ke1 Ke3 47. Rxh6 *
Position (FEN): 8/8/7R/8/4p3/4k3/r5PP/4K3 b - - 0 47
Black to move.
Themes:  Endgame, Rook Endgame Mate in 1 
Puzzle rating: 854
Best move: Ra1#