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 "Unknown219"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "4r3/4P2P/pR3B2/3k4/1P1p2b1/4p3/P7/4K3 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Rc8 2. Kf1 d3 ( { Black can try: } 2... e2+ 3. Kf2 Rc1 4. e8=Q Rf1+ 5. Kg2 e1=Q 6. Qc6# ) 3. h8=Q Rxh8 4. Bxh8 d2 5. Kg2 d1=Q 6. e8=Q Qf3+ 7. Kh2 Qf2+ 8. Kh1 Bf3# 0-1