Trade pawns in the center to open up diagonals. The fewer pawns there are in the center, the more scope your bishops will have. Aiming both of your bishops at the opponent's king also increases the chance for tactical and mating combinations. Remember, without pawns in the center, enemy knights won't be able to use a centralized outpost.
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[Event "Hans Berliner Combinations"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Nicholas Rossolimo"]
[Black "Hans Berliner"]
[Result "0-1"]
[BlackElo "0"]
[FEN "2r1r1k1/pb1Nb1pp/1p6/3n4/3Qp3/1P4Pq/PB1N1P1P/3R1RK1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Bf6 { First some defense. } 2. Nxf6+ Nxf6 { Now the threats of e3 or Ng4
are too great. } 3. f3 ( 3. Nc4 e3 4. Nxe3 Rxe3 5. f3 Rc2 6. Rf2 Rxf2 7. Kxf2 Rxf3+ 8. Ke1 Rf1+ 9. Kd2 Qh6+ 10. Kc2 Be4+ 11. Kc3 Rxd1 12. Qxd1 Qe3+ 13. Kb4 Qc5+ 14. Ka4 Qa5# ) ( 3. Rde1 Red8 4. Qe3 Ng4 5. Qe2 Qxh2# ) 3... exf3 4. Nxf3 Re2 5. Rf2 Bxf3 6. Rxe2 Bxe2 7. Re1 Bf3 8. Qf2 Ng4 9. Qd2 Nxh2 10. Qxh2 Qxh2+ 11. Kxh2 Rc2+ 12. Kg1 Rg2+ 13. Kf1 Rxb2 14. Re3 Bg2+ 15. Ke1 Rxa2 16. Kd1 Kf7 0-1