Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. Nf3 g6 3. Bf4 Bg7 4. e3 O-O 5. Bd3 d6 6. Nbd2 Nbd7 7. c3 c5 8. Qc2
a6 9. a4 Nd5 10. Bg3 N7f6 11. e4 Nb6 12. O-O Nh5 13. Bh4 Nf4 14. Rfe1 Nxd3 15.
Qxd3 cxd4 16. Nxd4 Bd7 17. b3 Qc7 18. a5 Nc8 19. N2f3 e5 20. Ne2 Bc6 21. c4 Ne7
22. Rec1 f5 23. Bxe7 Qxe7 24. Ng3 f4 25. Ne2 Rfd8 26. b4 Rac8 27. b5 Be8 28.
Nc3 Bf7 29. Nd5 Bxd5 30. cxd5 axb5 31. Qxb5 Ra8 32. Qb6 Ra6 33. Qc7 Qxc7 34.
Rxc7 Rda8 35. Ng5 b6 36. Ne6 Bh6 37. Rac1 Rxa5 38. Rc8+ Rxc8 39. Rxc8+ Kf7 40.
Rc7+ Kf6 41. Rxh7 *
Position (FEN): 8/7R/1p1pNkpb/r2Pp3/4Pp2/8/5PPP/6K1 b - - 0 41
Black to move.
Themes:  Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 618
Best move: Ra1#