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 "Unknown520"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "3r3k/1p5p/p4p2/3q1PpQ/5r2/5P2/6K1/1BR4R b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Qd2+ 2. Kg3 Rh4 3. Rxh4 gxh4+ 4. Qxh4 Rg8+ 5. Kh3 Qg2# 0-1