Knight endgames can be very tricky, especially when there are passed pawns involved.
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[Event "Olympiad"]
[Site "Dubrovnik"]
[Date "1950.??.??"]
[Round "?"]
[White "Reshevsky, Samuel"]
[Black "Mastichiadis, Fotis"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "2b1r1k1/1p1nqp2/2p3pp/1P1p4/3P2n1/2NBP1P1/1Q1N1PP1/R5K1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Nxf2 2. bxc6 ( { White can try: } 2. Kxf2 Qxe3+ 3. Kf1 Qxd3+ 4. Kg1 Qxd4+ 5. Kh1 { Black wins with a large material advantage. } ) 2... bxc6 3. Bxg6 fxg6 4. Kxf2 Qxe3+ 5. Kf1 Ba6+ 6. Rxa6 Qe1# 0-1