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 "Unknown422"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/8/p7/1p6/8/1P1K4/P7/3k4 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Kc1 2. Kc3 a5 3. a3 Kb1 4. b4 a4 5. Kd4 Kb2 6. Kc5 Kxa3 7. Kxb5 Kb3 8. Kc5 a3 9. b5 a2 10. b6 a1=Q 11. b7 Qh8 12. Kc6 Qb8 { Black wins with a large
material advantage. } 0-1