Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. f3 c5 5. d5 b5 6. e4 bxc4 7. Bxc4 exd5 8. Bxd5
Nxd5 9. Qxd5 Nc6 10. Ne2 O-O 11. O-O Bb7 12. Bf4 Qb6 13. Qh5 Nd4 14. Nxd4 cxd4
15. Nd5 Bxd5 16. Qxd5 Bc5 17. b3 Rac8 18. Rac1 d6 19. Kh1 h6 20. Rc4 a5 21.
Rfc1 Kh8 22. h3 Rcd8 23. Rd1 Qa7 24. Bc1 f5 25. e5 Qe7 26. e6 Rf6 27. Re1 Re8
28. Bd2 Rxe6 29. Rxe6 Qxe6 30. Qxe6 Rxe6 31. Bxa5 d3 32. Rc1 Re2 33. a4 Rb2 34.
b4 Bxb4 35. Bxb4 Rxb4 36. Rd1 Rxa4 37. Rxd3 Ra6 38. Rd5 g6 39. h4 Kg7 40. h5
Kf6 41. hxg6 Kxg6 42. Kh2 Kf6 43. Kg3 Ke6 44. Rb5 d5 45. Kf4 Ra4+ 46. Ke3 Ke5
47. Rb6 Ra3+ 48. Kf2 Ra2+ 49. Ke3 Rxg2 *
Position (FEN): 8/8/1R5p/3pkp2/8/4KP2/6r1/8 w - - 0 50
White to move.
Themes:  Endgame, Rook Endgame Mate in 1 
Puzzle rating: 974
Best move: f4#