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 "Unknown179"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[ECO "A00"]
[FEN "b1r3k1/p3qp1p/1p2pp2/2b5/2Pr2N1/3B3P/PP2QPP1/3R1RK1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. b4 ( { White can try: } 1. Nxf6+ Qxf6 { Black wins with a large material
advantage. } ) ( { White can also try: } 1. Nh6+ Kg7 2. Nf5+ ( 2. Qh5 Qb7 3. Nf5+ exf5 4. Bxf5 Qxg2# ) 2... exf5 3. Qxe7 Bxe7 4. Bxf5 Rcxc4 { Black wins with a large
material advantage. } ) 1... Qb7 ( { Black can try: } 1... Bxb4 2. Bxh7+ Kxh7 3. Rxd4 Rg8 4. Qd3+ f5 5. Rd7 Qg5 6. Rxf7+ Kh8 7. Qd7 Rg7 8. Rxg7 Qxg7 9. Qd8+ Qf8 10. Rd1 fxg4 11. Rd7 Qxd8 12. Rxd8+ Kg7 13. Rxa8 gxh3 14. gxh3 { White
wins with a large material advantage. } ) 2. Ne3 Rcd8 3. bxc5 bxc5 { White wins
with a large material advantage. } 1-0