Get closer to the endgame. With fewer pieces left in the position, the dominance of the two bishops can really be felt, as they can control both sides of the board at once. If the enemy knight doesn't have a secure outpost to use, it can find itself passive and restricted in its own territory.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown031"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/8/8/2k1KP2/r2p4/8/8/3R4 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. f6 Ra8 2. Rc1+ Kb6 3. Kxd4 Rf8 4. Ke5 Re8+ 5. Kd6 Re2 6. f7 Rf2 7. Ke7 Re2+ 8. Kf8 Kb5 9. Rg1 Rf2 10. Kg7 Kc5 11. f8=Q+ Rxf8 12. Kxf8 { White wins
with a large material advantage. } 1-0