Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. Bf4 g6 3. Nc3 d5 4. f3 Bg7 5. Qd2 c5 6. O-O-O cxd4 7. Qxd4 Nc6 8.
Qd2 e5 9. Bh6 Bxh6 10. Qxh6 d4 11. e3 Bd7 12. exd4 Nxd4 13. f4 Nf5 14. Qh3 exf4
15. Re1+ Kf8 16. g4 Ng7 17. Qf3 Bc6 18. Qxf4 Bxh1 19. Qb4+ Kg8 20. g5 Nd5 21.
Nxd5 Bxd5 22. Nh3 Qf8 23. Qd4 Bc6 24. Nf2 Rd8 25. Ng4 Rxd4 *
Position (FEN): 5qkr/pp3pnp/2b3p1/6P1/3r2N1/8/PPP4P/2K1RB2 w - - 0 26
White to move.
Themes:  Middlegame Mate in 1, Smothered Mate 
Puzzle rating: 645
Best move: Nf6#