The bishop when used properly can be your most useful piece.
When used improperly you will lament the powerlessness of the bishop.
She moves diagonally across the battlefield, always forced to remain on
the same color square that she started off from. Fortunately for
you, you get two bishops, one on each color. When these two bishops
are used together, they are fearfully powerful. We can mourn in advance
for the poor queen or king who comes in the path of the bishop sisters.
Alone, these bishops still retain some power. Their far reach diagonally
across the battlefield can keep track of certain key posts.
Bishops are most useful in open positions in which there are not so many
pawns to block the far reach of the bishop. In the end game, a pair
of bishops is one of the deadliest weapons.