Chess puzzle (Checkmate)
Moves: 1. Nf3 d6 2. g3 Nf6 3. Bg2 e5 4. O-O Nc6 5. d4 exd4 6. Nxd4 Bd7 7. c4 h5 8. Bg5
Be7 9. Nc3 a6 10. Qd2 Nxd4 11. Qxd4 Bc6 12. Bxc6+ bxc6 13. Bxf6 Bxf6 14. Qe4+
Kd7 15. Qf5+ Ke8 16. Qe4+ Kd7 17. Qf5+ Ke8 18. Rfd1 Qd7 19. Qf3 h4 20. g4 Rb8
21. b3 Bxc3 22. Qxc3 Qxg4+ 23. Kh1 Kf8 24. Rg1 Qe4+ 25. f3 Qe5 26. Qxe5 dxe5
27. Rad1 Rh6 28. Rd7 Re8 29. Rgd1 h3 30. Rxc7 Kg8 31. Rdd7 e4 32. f4 e3 33.
Rxf7 Rg6 34. Rcd7 Rg2 35. f5 Re4 36. f6 gxf6 37. Rh7 Reg4 38. Rxh3 *
Position (FEN): 6k1/3R4/p1p2p2/8/2P3r1/1P2p2R/P3P1rP/7K b - - 0 38
Black to move.
Themes:  Endgame, Rook Endgame Mate in 1 
Puzzle rating: 400
Best move: Rg1#