Knight endgames can be very tricky, especially when there are passed pawns involved.
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[Event "rated untimed match"]
[Site "?"]
[Date "1973.??.??"]
[Round "?"]
[White "Radulov"]
[Black "Cuellar"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "2r3k1/p1R1ppbp/q2p2p1/4n3/3NP3/1P2BP2/P2Q2PP/6K1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Qe2 Qxe2 ( { Black can try: } 1... Nd3 2. Rxc8+ Qxc8 3. Qxd3 { White wins
with a large material advantage. } ) 2. Rxc8+ Bf8 3. Nxe2 { White wins with a
large material advantage. } 1-0