Chess puzzle (Checkmate)
Opening: Old_Indian_Defense, Old_Indian_Defense_Other_variations
Moves: 1. d4 Nf6 2. c4 d6 3. Nc3 g6 4. e4 Nbd7 5. Nf3 Bg7 6. Be3 O-O 7. Be2 Re8 8. Qd2
c6 9. e5 dxe5 10. dxe5 Ng4 11. O-O-O Nxe3 12. Qxe3 b6 13. e6 fxe6 14. Qxe6+ Kh8
15. Ng5 Qc7 16. Nf7+ Kg8 17. Nh6+ Kh8 18. Qg8+ Rxg8 *
Position (FEN): r1b3rk/p1qnp1bp/1pp3pN/8/2P5/2N5/PP2BPPP/2KR3R w - - 0 19
White to move.
Themes:  Middlegame Mate in 1, Smothered Mate 
Puzzle rating: 859
Best move: Nf7#