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 "Unknown025"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "2k5/p1p5/2Pb1p2/5PP1/P1p5/2r4P/3R2K1/8 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Rxd6 cxd6 2. gxf6 ( { White dare not try: } 2. g6 Re3 3. h4 c3 4. h5 c2 5. h6 c1=Q 6. h7 Qd2+ 7. Kf1 Re1# ) 2... Kd8 3. f7 Ke7 4. c7 Kxf7 5. c8=Q { White wins
with a large material advantage. } 1-0