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 "Unknown438"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[ECO "A00"]
[FEN "5r2/5p2/ppP2qk1/7p/P2R2p1/1PQ3K1/6PP/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... h4+ 2. Kxg4 Qf5+ 3. Kxh4 Qg5+ ( { Black can try: } 3... Rh8+ 4. Kg3 { White escapes. } ) 4. Kh3 Rh8+ 5. Rh4 Rxh4# 0-1