A Bishop is considered good when its pawns are not on its color. A Bishop is considered bad when its central pawn is on its color and blocking the Bishop. An active Bishop can be either bad or good. It is called an active Bishop when it serves an active function
If you have a bad Bishop you must correct in one of the following ways:
1) Trade for an enemy piece equal or greater value For example:
2) Make your Bishop good by taking the central pawns off its color 3) make your bishop active by getting out of the pawn chain
Bishops are usually stronger in open positions. The fewer pawns that are in the way of the bishop the better the bishop is. In general, bishops tend to have an edge in open positions.
In an endgame where there are passed pawns on both sides of the board, bishops are better than knights.
In this position, black is ahead in material, yet white can win the game because of the bishop stops all three passed pawns from promoting.
Knights are short-ranged pieces, but they can be as deadly as a bishop.
Knights need advanced support points in order to be superior.
1) A Knights on the first rank and second rank are very defensive 2) A Knight on the third rank is ready to be aggressive 3) A Knight on the fourth rank is as good as a bishop 4) A Knight on the fifth rank is often better than a bishop 5) A Knight on the sixth rank is advantages and can do very deadly attack
Knight are very superior in closed positions for example:
Knight are the best blockaders of passed pawns.
Knights are usually superior to bishops in endings with pawns on one side pf the board.