Knight endgames can be very tricky, especially when there are passed pawns involved.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown06"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "2bq1r1k/5ppp/p2p1N2/4pP2/2p1P3/P4Q2/r1P3PP/3R1R1K w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Nxh7 { The beginning of a long attack. } 1... Kxh7 2. Qh5+ Kg8 3. f6 { Opening up
lines of attack. } 3... gxf6 4. Rf3 Re8 5. Qh6 { Preventing the king's escape via
f8. } 5... Bg4 6. Rg3 f5 7. exf5 Re6 { Giving back material to delay mate. } 8. Rxg4+ Rg6 9. fxg6 Qf6 10. Qh7+ Kf8 11. gxf7 Qxf7 12. Qh6+ Ke8 13. Qxd6 { The black
king is not long for this world. } 13... Qe7 14. Rg8+ Kf7 15. Qg6# 1-0