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 "Unknown92"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [ECO "A00"] [FEN "8/pkp4p/2nb4/8/5p1q/P1B1r3/1PP3QN/R4R1K b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... f3 2. Rxf3 Rxf3 3. Rg1 Rh3 4. Qg4 Rxh2# 0-1