adversary creates a pawns structure defending with his piece and the King,
the weak pawns of his fortress, the only ones that can be attacked by our
Bishop. Undermine these structures is not at all easy. A 1971 Fischer game, can be a useful example of the technique to be used in these cases to break through the enemy fortress.
[fen]8/8/1pnk2p1/pBp2p1p/P4P1P/2P3P1/1P2K3/8 w - - 0 45[/fen]
I created a training with this position. Using it with Fritz, you'll have to play some moves, with a time and a score.
Of course it is not good to go see the game in the database, before you have played the training.
Download training: Training1