Chess puzzle (Checkmate)
Moves: 1. Nf3 e6 2. g3 f5 3. Bg2 Nf6 4. d3 d5 5. O-O Nc6 6. c4 dxc4 7. dxc4 Qxd1 8.
Rxd1 Bd6 9. Nc3 O-O 10. Nb5 Ne8 11. b3 a6 12. Nxd6 Nxd6 13. Ba3 Rd8 14. Rd2 Ne4
15. Rxd8+ Nxd8 16. Rd1 Nf7 17. Nd4 c5 18. Bxe4 fxe4 19. Bxc5 e5 20. Nc2 Bg4 21.
Kf1 Re8 22. Ne3 Bh3+ 23. Ke1 h5 24. b4 Re6 25. Rd7 b6 26. Be7 h4 27. gxh4 Rg6
28. Rb7 Rg1+ 29. Kd2 Ra1 30. Rxb6 Rxa2+ 31. Nc2 e3+ 32. fxe3 Bf5 33. c5 Rxc2+
34. Ke1 Be6 35. Rxe6 Nh6 36. Rxa6 Ng4 37. Bg5 e4 38. Kd1 Rb2 39. Rb6 Nf2+ 40.
Kc1 Rb3 41. Kc2 Ra3 42. Kb2 Ra8 43. Kb3 Nd1 44. Kc4 Nb2+ 45. Kb5 Na4 46. Ra6
Nc3+ 47. Kb6 Rb8+ 48. Ka5 *
Position (FEN): 1r4k1/6p1/R7/K1P3B1/1P2p2P/2n1P3/4P2P/8 b - - 21 48
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 649
Best move: Rb5#