Chess puzzle (Checkmate)
Moves: 1. e4 Nc6 2. Nc3 e5 3. d3 Bb4 4. Bd2 Nge7 5. f4 Ng6 6. fxe5 Ngxe5 7. Nf3 d6 8.
Nxe5 Nxe5 9. d4 Ng4 10. Be2 Qh4+ 11. g3 Qh3 12. Bxg4 Bxg4 13. Qc1 Qg2 14. Rf1
Bh3 15. Rf2 Qg1+ 16. Ke2 Qxc1 17. Rxc1 O-O 18. Nd5 Bxd2 19. Kxd2 c6 20. Ne3 Bd7
21. Rcf1 Rae8 22. Kd3 Re6 23. c3 Rg6 24. Nf5 Re8 25. Nxd6 Rxd6 26. Rxf7 Be6 27.
Rxb7 a5 28. Ra7 Bh3 29. Re1 Rf6 30. Rxa5 Rf3+ 31. Kc4 Rf2 32. b3 Rxh2 33. b4
Rg2 34. Re3 Rf2 35. Kc5 Bg2 36. Kxc6 Bxe4+ 37. Kc5 Rf5+ 38. Kb6 Rb8+ 39. Ka7
Rb7+ 40. Ka6 *
Position (FEN): 6k1/1r4pp/K7/R4r2/1P1Pb3/2P1R1P1/P7/8 b - - 7 40
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 1025
Best move: Rf6#