Chess puzzle (Checkmate)
Opening: Kings_Gambit_Declined, Kings_Gambit_Declined_Falkbeer_Countergambit_Accepted
Moves: 1. e4 e5 2. f4 d5 3. exd5 Qxd5 4. Nf3 exf4 5. d4 Nc6 6. Qe2+ Be7 7. Nc3 Qe6 8.
Bxf4 Qxe2+ 9. Bxe2 Bg4 10. O-O-O O-O-O 11. h3 Bxf3 12. Bxf3 Nxd4 13. Bg4+ Ne6
14. Bxe6+ fxe6 15. Rxd8+ Kxd8 16. Rd1+ Kc8 17. Nb5 c6 *
Position (FEN): 2k3nr/pp2b1pp/2p1p3/1N6/5B2/7P/PPP3P1/2KR4 w - - 0 18
White to move.
Themes: Queenside Attack Endgame Mate in 1 
Puzzle rating: 931
Best move: Nxa7#