Chess puzzle (Checkmate)
Moves: 1. d4 d5 2. Bf4 Nf6 3. e3 c5 4. c3 Nc6 5. Nf3 Bg4 6. Nbd2 e6 7. Be2 Rc8 8. O-O
Bxf3 9. Nxf3 Bd6 10. Bxd6 Qxd6 11. Qb3 O-O 12. Rfd1 c4 13. Qxb7 Rb8 14. Qa6
Rxb2 15. Rd2 Rb6 16. Qa4 Ne4 17. Rc2 Rfb8 18. g3 h6 19. Nd2 Nf6 20. e4 e5 21.
exd5 Nxd5 22. Nxc4 Rb1+ 23. Rxb1 Rxb1+ 24. Kg2 Qg6 25. Nxe5 Qe4+ 26. Bf3 Qe1
27. Qxc6 *
Position (FEN): 6k1/p4pp1/2Q4p/3nN3/3P4/2P2BP1/P1R2PKP/1r2q3 b - - 0 27
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1633
Best move: Qf1#