Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Ba6 5. Qc2 Bb4+ 6. Bd2 Be7 7. Bg2 O-O 8. e4
d5 9. exd5 exd5 10. O-O Bxc4 11. Rc1 c6 12. Ne5 Ba6 13. Nxc6 Nxc6 14. Qxc6 Rc8
15. Qa4 Rxc1+ 16. Bxc1 Qc8 17. Nc3 Re8 18. Nxd5 Nxd5 19. Bxd5 Bf6 20. Be3 Bb7
21. Rc1 Qxc1+ 22. Bxc1 Re1+ 23. Kg2 Bxd5+ 24. Kh3 h5 25. Be3 Rg1 26. Qe8+ Kh7
27. f4 *
Position (FEN): 4Q3/p4ppk/1p3b2/3b3p/3P1P2/4B1PK/PP5P/6r1 b - - 0 27
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 1536
Best move: Bg2#