Chess puzzle (Checkmate)
Moves: 1. d4 d6 2. e4 h6 3. Nc3 g5 4. f4 Bg7 5. fxg5 Nc6 6. d5 Nd4 7. Be3 e5 8. dxe6
Nxe6 9. gxh6 Nxh6 10. Be2 a6 11. Qd2 b5 12. O-O-O Bb7 13. h3 b4 14. Nd5 a5 15.
Nf3 f6 16. g4 Nf7 17. Nd4 Bxd5 18. exd5 Nxd4 19. Bxd4 Ne5 20. Bb5+ Kf7 21. Kb1
Kg8 22. Rdg1 Qe7 23. g5 f5 24. h4 Rb8 25. Be2 a4 26. h5 Ng4 27. Bxg4 fxg4 28.
Re1 Qf7 29. g6 Qxd5 30. Qe3 Bxd4 31. Qe7 b3 32. axb3 axb3 33. c3 Qf5+ 34. Re4
d5 35. Qf7+ Qxf7 36. gxf7+ Kxf7 37. Rxd4 c6 38. Rxg4 Rbg8 39. Rb4 Rxh5 40. Rxh5
*
Position (FEN): 6r1/5k2/2p5/3p3R/1R6/1pP5/1P6/1K6 b - - 0 40
Black to move.
Themes:  Endgame, Rook Endgame Mate in 1 
Puzzle rating: 518
Best move: Rg1#