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 "Unknown387"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "1k6/p1p5/1p3p2/1P3Pp1/P5Pb/1q1rB3/Q5R1/R4K2 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Rd1+ 2. Ke2 Re1+ ( { Black can try: } 2... Qd3+ 3. Kf3 Qf1+ 4. Rf2 Qh1+ 5. Rg2 Rxa1 6. Qg8+ Kb7 7. Qd5+ Kc8 8. Qg8+ Kd7 9. Qe6+ Kd8 10. Qxf6+ Ke8 11. Qe6+ { Draw. Black cannot escape the checks. } ) 3. Kd2 ( { White can try: } 3. Rxe1 Qxa2+ 4. Kf3 Qd5+ 5. Ke2 Qxg2+ 6. Kd1 Bxe1 7. Kxe1 Qg3+ 8. Kd2 Qxg4 { Black wins with a large material advantage. } ) 3... Qxe3+ 4. Kc2 Qe4+ 5. Kb2 Qxg2+ 6. Ka3 Qf3+ 7. Kb4 Re4+ 8. Qc4 Qd3 9. Rc1 Be1+ 10. Rxe1 Rxc4# 0-1