Chess puzzle (Checkmate)
Moves: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. c4 Nf6 6. Nc3 Qc7 7. Be2 d6 8. Be3
b6 9. Qd2 Be7 10. O-O Bb7 11. f3 O-O 12. Rac1 Nbd7 13. Rfd1 Rac8 14. a3 Qb8 15.
Kh1 Bd8 16. Nc2 Bc7 17. b4 Rfe8 18. a4 h5 19. Bg5 Kh7 20. Qd4 Rh8 21. Bh4 Rhg8
22. Qd2 Ne5 23. Nd4 Bd8 24. Nb1 Be7 25. Bd3 Rgd8 26. Qe3 Qc7 27. Nd2 g6 28.
N4b3 Ba8 29. Bf2 Nxd3 30. Qxd3 Qb7 31. Qe3 b5 32. axb5 axb5 33. Qb6 bxc4 34.
Rxc4 Rxc4 35. Nxc4 Rd7 36. Nca5 Qxb6 37. Bxb6 d5 38. Bc5 Bxc5 39. Nxc5 Rd8 40.
e5 Nd7 41. f4 Nb6 42. b5 Rc8 43. Ncb7 Bxb7 44. Nxb7 Rc2 45. Nd6 Kg8 46. Ra1 Rb2
47. Ra6 *
Position (FEN): 6k1/5p2/Rn1Np1p1/1P1pP2p/5P2/8/1r4PP/7K b - - 6 47
Black to move.
Themes:  Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 670
Best move: Rb1#