Chess puzzle (Checkmate)
Moves: 1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. O-O O-O 5. e3 d6 6. c4 Nc6 7. d4 e5 8. d5 Ne7
9. Nc3 Ne8 10. Nd2 f5 11. f3 Nf6 12. e4 fxe4 13. fxe4 Bg4 14. Qb3 b6 15. a4 Qd7
16. Nf3 Bh3 17. Bxh3 Qxh3 18. Ng5 Qg4 19. Ne6 Rf7 20. Qc2 Rc8 21. a5 c6 22.
axb6 axb6 23. dxc6 Qxe6 24. Nd5 Rxc6 25. Ra8+ Rf8 26. Rxf8+ Kxf8 27. Bg5 Nxd5
28. exd5 Qxd5 29. cxd5 Rxc2 30. Bxf6 Bxf6 31. Rxf6+ Ke7 32. Re6+ Kd7 33. Rf6
Rxb2 34. Rf7+ Kd8 35. Rxh7 Rd2 36. Rh8+ Ke7 37. Rh7+ Kf6 38. Rb7 Rxd5 39. Rxb6
Kg5 40. Kf2 Rd2+ 41. Kf3 d5 42. h4+ Kf5 *
Position (FEN): 8/8/1R4p1/3ppk2/7P/5KP1/3r4/8 w - - 1 43
White to move.
Themes:  Endgame, Rook Endgame Mate in 1 
Puzzle rating: 819
Best move: g4#