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 "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "White player"]
[Black "Black player"]
[Result "*"]
[BlackElo "0"]
[FEN "6k1/8/2K5/P4p2/3R3p/2P2rp1/1P6/8 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
{ Promotion with Check. } 1. a6 Rf1 { Black attempts to get behind white's
advanced a-pawn. } 2. Ra4 { White gets behind his pawn first. } 2... g2 3. a7 g1=Q 4. a8=Q+ { Promotion with check gives white just enough to win. } 4... Kf7 5. Ra7+ Kg6 6. Qg8+ Kf6 7. Qh8+ Ke6 8. Qh6+ Ke5 9. Re7# *