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 "1861.??.??"]
[Round "?"]
[White "Zalbach"]
[Black "Polmecher"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "rnbqkb1r/pp1p3p/4p1p1/2pnN3/4N3/8/PPP2PPP/R1BQKB1R w KQkq - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Qf3 { Black can try: } 1... Qc7 ( 1... Qe7 2. Bg5 Qg7 3. Nf6+ Nxf6 4. Bxf6 Qg8 5. O-O-O Be7 ( { Black can try: } 5... Bg7 6. Bb5 a6 7. Ba4 Qf8 8. Nxd7 Nxd7 9. Rxd7 Bxd7 10. Bxd7+ Kxd7 11. Qxb7+ Ke8 12. Bxg7 Qf4+ 13. Kb1 Qb8 14. Qxb8+ Rxb8 15. Bxh8 { White wins with a large material advantage. } ) 6. Bc4 Bxf6 7. Qxf6 Qf8 8. Nf7 Qxf7 9. Qxh8+ Qf8 10. Qxh7 { White wins with a large material
advantage. } ) 2. Qf7+ Kd8 3. Bg5+ Ne7 ( { Black can try: } 3... Be7 4. Bxe7+ Nxe7 5. Qg7 Re8 6. Nf7# ) 4. Qe8+ Kxe8 5. Nf6+ Kd8 6. Nf7# 1-0