Knight endgames are like king and pawn endgames. This rule of thumb was given by former world champion Mikhail Botvinnik, who observed that if a king and pawn endgame was winning, the evaluation would be the same with knights on the board. We can infer that protected or outside passed pawns can be a huge asset in knight endgames, because the stronger side can always offer to trade knights, and the defending side will need to retreat in order to avoid the trade.
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[Event "rated untimed match"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "Unknown"] [Black "Unknown050"] [Result "1-0"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "b5k1/3p1rb1/p2Bp3/2Pnnp2/8/P1P4R/B1P3PP/3R2K1 w - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. Rb1 Nf4 ( { Black can try: } 1... Bc6 2. Rb8+ Rf8 3. Rxf8+ Bxf8 4. Bxe5 Bxc5+ 5. Bd4 Bf8 { White wins with a large material advantage. } ) ( { Black can also try: } 1... Ne7 2. Bxe7 Rxe7 3. Rb8+ Kf7 4. Rxa8 Re8 5. Rxa6 { White wins with a large material advantage. } ) 2. Rb8+ Rf8 3. Bxf8 Nxh3+ 4. gxh3 Bxf8 5. Rxa8 { White wins with a large material advantage. } 1-0