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 "Unknown637"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "6k1/5pp1/pr3p1p/5P2/PP2R3/1r5P/6P1/4R2K w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Re8+ Kh7 2. Rf8 g6 3. Rxf7+ Kg8 4. fxg6 Rb8 5. Re6 R3xb4 6. Rxa6 R4b7 7. Rfxf6 Kg7 8. Rf7+ Rxf7 9. gxf7 Kxf7 10. Rxh6 { White wins with a large
material advantage. } 1-0