Chess puzzle (Checkmate)
Moves: 1. e4 c5 2. Nc3 g6 3. d4 cxd4 4. Qxd4 Nf6 5. Be3 Nc6 6. Qd2 Bg7 7. O-O-O b6 8.
Kb1 Bb7 9. f3 Qc7 10. Nb5 Qb8 11. Bf4 e5 12. Nd6+ Ke7 13. Bg5 Nd4 14. Nxb7 Qxb7
15. Bc4 Qc6 16. Bd5 Qb5 17. Bxa8 Rxa8 18. Ne2 Qc5 19. Nxd4 Qxd4 20. Qxd4 exd4
21. Rxd4 Ke6 22. Bxf6 Bxf6 23. Rd5 Rc8 24. Rhd1 Rc7 25. Rd6+ Ke7 26. f4 g5 27.
e5 Bg7 28. g3 Ke8 29. R6d5 gxf4 30. gxf4 Bh6 31. f5 Bf4 32. h3 f6 33. exf6 d6
34. Re1+ Kf7 35. Re6 Be5 36. b3 Rc3 37. a4 Rxh3 38. Re7+ Kxf6 39. Rxa7 Rh1+ 40.
Ka2 *
Position (FEN): 8/R6p/1p1p1k2/3RbP2/P7/1P6/K1P5/7r b - - 2 40
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 500
Best move: Ra1#