Chess puzzle (Checkmate)
Moves: 1. e4 c5 2. Nf3 Nc6 3. Bb5 Nd4 4. Nxd4 cxd4 5. O-O a6 6. Bc4 Nf6 7. e5 Ng8 8.
Qf3 e6 9. d3 Rb8 10. a4 Bc5 11. Qg3 Kf8 12. Bg5 Ne7 13. Nd2 b5 14. axb5 axb5
15. Bb3 h6 16. Bxe7+ Bxe7 17. Ne4 Bb7 18. Nd6 Bxd6 19. exd6 Qg5 20. Qxg5 hxg5
21. Ra7 g6 22. c3 dxc3 23. bxc3 Kg7 24. c4 bxc4 25. Bxc4 Bc6 26. f3 Kf6 27. Re1
Ra8 28. Raa1 Rhb8 29. Kf2 Rb2+ 30. Kg3 Rh8 31. Rg1 Ke5 32. Ra5+ Kxd6 33. Rxg5
Rhb8 34. Ra5 Rd2 35. Kf4 Rbb2 36. Kg3 f5 37. Ra7 Ke7 38. Ra5 Kf6 39. Kf4 g5+
40. Ke3 e5 41. g3 f4+ 42. gxf4 *
Position (FEN): 8/3p4/2b2k2/R3p1p1/2B2P2/3PKP2/1r1r3P/6R1 b - - 0 42
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 1354
Best move: gxf4#