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 "Unknown459"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/5p2/1p4pp/1Pk5/P5P1/2K4P/8/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... f5 2. gxf5 gxf5 3. Kb3 f4 4. Kc3 h5 5. h4 f3 6. Kd3 Kb4 7. Ke3 Kxa4 8. Kxf3 Kxb5 9. Kf4 Kc4 10. Kg5 b5 11. Kxh5 b4 12. Kg5 b3 13. h5 b2 14. h6 b1=Q 15. Kf6 Qh7 16. Kg5 Kd5 { Black wins with a large material advantage. } 0-1