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 "Unknown503"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "1r3r1k/p3q2p/4p1pQ/2b1P1N1/6P1/3p4/PP4KP/R1B2R2 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Rxf1 ( { Black can try: } 1... Qb7+ 2. Nf3 Rxf3 3. Rxf3 Rf8 4. Qh3 Qd5 5. Bh6 Rf7 6. Rd1 { White wins with a large material advantage. } ) 2. Kxf1 Rf8+ 3. Kg2 ( { White can try: } 3. Ke1 Bb4+ 4. Bd2 Bxd2+ 5. Kxd2 Qb4+ 6. Kxd3 Rd8+ 7. Ke2 Qxb2+ 8. Ke3 Qd2+ 9. Ke4 Rd4+ 10. Kf3 Rd3+ 11. Ke4 Qe3# ) 3... Qb7+ 4. Kh3 Rf3+ 5. Nxf3 Qxf3+ 6. Kh4 Bf2+ 7. Kg5 Be3+ 8. Bxe3 Qxe3+ 9. Kf6 Qxh6 { Black wins with a large material advantage. } 0-1