Minor pieces can deliver checkmates on their own, too. A pair of bishops can work together effectively; as each one can be dominant on squares of a single color, together they can dominate the entire board.
In the diagram above, White's king is in a precarious position. His pawn prevents him from moving up to h2, while Black's dark-squared bishop stops him from walking out to g1. At the moment, his only safe squares lie on the light-squared diagonal, and one attack along that line will spell disaster. Black can deliver checkmate by playing Be5++.
