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 "Vienna"] [Site "?"] [Date "1907.??.??"] [Round "?"] [White "Duras, Olrich"] [Black "Spielmann, Rudolf"] [Result "1-0"] [BlackElo "unknown"] [ECO "B01"] [TimeControl "0"] [WhiteElo "unknown"] 1. e4 { B01: Scandinavian Defence } 1... d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 Nf6 5. Nf3 Bg4 6. Be2 { The immediate 6. h3 is stronger. } 6... Nc6 7. Be3 O-O-O 8. Nd2 Bxe2 9. Qxe2 Qf5 10. Nb3 e6 { Secures d5. } 11. a3 { Prevents intrusion on b4. } 11... Bd6 12. O-O-O Nd5 13. Na4 { White's knights angle for the support square c5 where they will in turn support an attack on black's king. } 13... e5 { Black attempts to remove the support for c5, and counter white's wing attack with center play. } 14. dxe5 Bxe5 { White creates threats along the open e-file } 15. Nac5 { Both sides are essentially equal in this position with a slight edge for black given his greater command of the center. The game will go to the side most able to generate favorable middle game play. In this position, black can try several ideas. Most promising are 15... Qf6 or 15... Nxe3 or 15... Rhe8 or some combination of those moves in the next few moves. } 15... Nb6 $2 { This move is passive and unnecessary. White begins to gain the advantage. } 16. a4 { White begins to deal mighty blows. The tide of battle begins to shift to white's favor. } 16... a5 { To prevent 17. a5 dislodging the foolish Knight followed by 18. a6 playing havoc with black's King. } 17. g4 $1 { Clearly white has a plan. This move drives the black Queen from the c8-h3 diagonal where it can defend against Nxb7 Kxb7 Nc5+ Kb8 Qa6 Qc8. } 17... Qf6 18. c3 Rhe8 $2 { 18... Bd6 is necessary. } 19. Nxb7 $1 { Demolishes the pawn shield. White intends Qa6. Now if 19... Kxb7, then 20. Nc5+ followed by 21. Qa6 and mate next. } 19... Rxd1+ 20. Rxd1 Bxc3 $2 { A desperate move. White still has the advantage after 20... Nb4 21. cxb4 Nxa4, but black gets a little more play. } 21. N7c5 { 21. Nd6+ is worth a look too. } 21... Nb4 { Now 22. bxc3 is unplayable. 22... Qxc3+ 23. Kb1 Nc4. } 22. g5 $1 Qe5 23. Nxa5 h5 $2 { Here black attempts to prevent white from playing Qg4+. Black should have played N6d5 returning it to where it should have stayed on move 15. } 24. bxc3 Qxc3+ 25. Kb1 Qxc5 26. Rd8+ { If 26... Kxd8 the 27. Nb7+ wins black's Queen. } 1-0