Make sure to use your king! When all else is equal, the side with the more active king will get the upper hand. If you're unsure how to evaluate a knight endgame, try to see which king is closer to the center or queenside -- the closer king will be able to contribute to the action first.
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[Event "rated untimed match"] [Site "?"] [Date "1955.??.??"] [Round "?"] [White "Aitkin"] [Black "Kefler"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "1r2r1k1/p2q1pbp/6p1/4n3/5Q2/2N3Pb/PPP2PBP/R1BR2K1 b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Qxd1+ 2. Nxd1 Nf3+ 3. Qxf3 Re1+ 4. Bf1 Rxf1# 0-1