Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 Nbd7 6. Be3 e5 7. d5 O-O 8. Be2
Ng4 9. Bd2 f5 10. exf5 gxf5 11. h3 Nxf2 12. Kxf2 e4 13. Bg5 Qe8 14. Nh4 Ne5 15.
Rf1 h6 16. Bf4 Qe7 17. Bxe5 Qxh4+ 18. Kg1 f4 19. Bxg7 Kxg7 20. Nxe4 Bxh3 21.
gxh3 Kf7 22. Rf2 Rg8+ 23. Rg2 Qxh3 24. Qf1 Rxg2+ 25. Qxg2 Qe3+ 26. Kf1 Rg8 27.
Qf3 *
Position (FEN): 6r1/ppp2k2/3p3p/3P4/2P1Np2/4qQ2/PP2B3/R4K2 b - - 4 27
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 877
Best move: Rg1#