Opposite-colored bishops

Opposite-colored bishops occur when one side has a light-squared bishop and the other has a dark-squared bishop. Because a bishop never changes its square color, the two bishops cannot attack each other directly or contest exactly the same squares.

In pure endings, where only kings, bishops, and pawns remain, that separation creates strong defensive possibilities. The weaker side may blockade pawns on squares controlled by its bishop that the opposing bishop can never attack. A material advantage, meaning one or more extra pawns, may therefore be insufficient. The ending is not automatically drawn: king placement, widely separated advanced pawns, and the ability to create more than one front still matter.

With queens or rooks still present, the effect may reverse. An attack on dark squares cannot be answered by a bishop that only controls light squares. The comparison with same-colored bishops therefore depends on the remaining pieces and whether a side is attacking or defending. The wrong rook pawn motif also appears frequently in these endings.