Chess puzzle (Checkmate)
Moves: 1. e4 e6 2. d4 b6 3. Nf3 Bb7 4. Bd3 Be7 5. c4 d6 6. O-O Nd7 7. d5 e5 8. Nc3 h6
9. Bc2 Ngf6 10. Ba4 O-O 11. Re1 Nc5 12. Bb3 Nh7 13. Ba4 Nxa4 14. Nxa4 Ng5 15.
Nxg5 Bxg5 16. Nc3 a6 17. Qg4 Bc8 18. Bxg5 Qxg5 19. Qxg5 hxg5 20. Re3 f6 21. Ne2
Bd7 22. b3 a5 23. a4 Kf7 24. Nc3 Ke7 25. Nb5 Bxb5 26. cxb5 Ra7 27. Rc1 Rh8 28.
Rec3 Kd7 29. h3 Rh4 30. f3 Rh8 31. Kf2 g6 32. Kg3 Rh7 33. Rh1 Ra8 34. Rhc1 Kc8
35. Rc6 Kb7 36. Kh2 f5 37. exf5 gxf5 38. Kg3 Rf8 39. Rh1 Rh4 40. Rd1 f4+ 41.
Kf2 Rh7 42. Ke2 Rfh8 43. Kd3 g4 44. fxg4 Rf8 45. Rf1 Rhf7 46. Rfc1 f3 47. gxf3
Rxf3+ 48. Ke4 R8f7 49. g5 Rxh3 50. g6 *
Position (FEN): 8/1kp2r2/1pRp2P1/pP1Pp3/P3K3/1P5r/8/2R5 b - - 0 50
Black to move.
Themes:  Endgame, Rook Endgame Mate in 1 
Puzzle rating: 996
Best move: Rf4#