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 "Unknown89"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[ECO "A00"]
[FEN "8/8/3k4/6R1/1np3P1/1b5P/5P2/4K3 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... c3 2. Ra5 Nd3+ ( { Black can try: } 2... Na2 3. Rxa2 Bxa2 4. Kd1 Bb3+ 5. Kc1 Ke5 6. h4 Kf4 7. h5 Kg5 8. f4+ Kxf4 9. h6 Bg8 10. Kc2 Kxg4 11. Kxc3 Kh5 12. Kd4 Kxh6 { Draw. } ) 3. Ke2 c2 4. Kxd3 c1=Q { Black wins with a large
material advantage. } 0-1