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 "London"]
[Date "1903.??.??"]
[Round "?"]
[White "Thornley"]
[Black "Griffith"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/8/pQ2pppk/2p5/5P2/KPn5/2P2P2/1r6 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Na4 2. Ka2 ( { Black dare not try: } 2. Qxa6 Ra1# ) ( { Black can try: } 2. bxa4 Rxb6 { Black wins with a large material advantage. } ) ( { Black dare not
try: } 2. Kxa4 Ra1# ) 2... Nxb6 3. Kxb1 { Black wins with a large material
advantage. } 0-1