Chess puzzle (Checkmate)
Moves: 1. f4 d5 2. Nf3 Bg4 3. e3 Nc6 4. h3 Bh5 5. g4 Bg6 6. f5 Bxf5 7. gxf5 e6 8. fxe6
fxe6 9. Rg1 Qd7 10. Bb5 Bd6 11. Nd4 Nge7 12. Rxg7 O-O-O 13. Qg4 Rhg8 14. Rxg8
Rxg8 15. Qxe6 Qxe6 16. Nxe6 Ne5 17. Kf1 Nf5 18. Nc3 Nh4 19. d4 Nef3 20. Nf4
Rg1+ 21. Ke2 Rh1 22. Bd3 Rh2+ 23. Kf1 Rh1+ 24. Kf2 Rh2+ 25. Kg3 *
Position (FEN): 2k5/ppp4p/3b4/3p4/3P1N1n/2NBPnKP/PPP4r/R1B5 b - - 12 25
Black to move.
Themes: Pin Middlegame Mate in 1 
Puzzle rating: 1528
Best move: Rg2#