A king and one bishop cannot checkmate the opposing king. However, a king and the bishop pair can. The king and bishops will force the king to a corner. If the king is in a dark corner, the dark bishop will be the one to deliver checkmate. If the king is in a light corner, the light bishop will be the one to deliver checkmate. Check out this example.
CHECKMATE WITH THE TWO BISHOPS
A king and one bishop cannot checkmate the opposing king. However, a king and the bishop pair can. The king and bishops will force the king to a corner. If the king is in a dark corner, the dark bishop will be the one to deliver checkmate. If the king is in a light corner, the light bishop will be the one to deliver checkmate. Check out this example.