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 "Unknown303"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "4r1k1/p1p2ppp/2Nq4/1P6/3P4/1Q6/P3nPPP/R4K2 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qxh2 2. Ne5 Rxe5 ( { Black dare not try: } 2... Qh1+ 3. Kxe2 Qxa1 4. Qxf7+ Kh8 5. Qxe8# ) 3. dxe5 Nf4 4. Ke1 Qg1+ 5. Kd2 Qxa1 { Black wins with a
large material advantage. } 0-1