I took Black, at lower levels v a computer the mistakes comes quicker.
I was hardly going to miss the final combo because today I blogged this.
White to play.
The trick is mate in 4 not 5 as in the Philidor Legacy.
1.Qe6+ Kh8 2.Nf7+ Kg8 3.Nd8+!
Mate next move.
It pays dividends to read the blog!
PGN
1. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qd5 Nf6 5. Qd3 Bc5 6. Nc3 O-O 7. Qc4 d6 8. Nf3 Be6 9. Nd5 Bxd5 10. exd5 Re8+ 11. Be3 Bxe3 12. fxe3 Rxe3+ 13. Be2 Re4 14. Qd3 Nb4 15. Qd2 Qe7 16. O-O Rxe2 17. Qxb4 Qe3+ 18. Kh1 Ne4 19. Qxb7 Re8 20. Qxc7 Nf2+ 21. Kg1 Nd1+ {The same idea from the blog.} 22. Kh1 Qf2 23. Rxf2 Re1+ 24. Rf1 Rxf1+ 25. Ng1 Nf2