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 "Unknown410"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "k1n4Q/2R5/4p3/pK1pBP2/2n3P1/2P5/2q5/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qb3+ 2. Kc6 Nxe5+ ( { Black can try: } 2... Qa4+ 3. Kc5 Qa3+ 4. Kd4 Nb6 5. Qe8 a4 6. Qc6+ Kb8 7. Qb7# ) 3. Qxe5 Qa4+ ( { Black can try: } 3... Qb6+ 4. Kd7 Qb8 5. Rxc8 Qxc8+ 6. Kxc8 Ka7 7. Qc7+ Ka6 8. Qb7# ) 4. Kc5 Qc4# 0-1