King and two Bishops versus King
3. Unlike queen and rook, bishop is not a linear piece; it can move only diagonally – and only along the squares of the same colour. Since bishop cannot control adjacent squares on the same file or rank, one bishop is not sufficient for mating purposes. However, two bishops win easily. The winning plan is the same as in the previous example. By a coordinated action of bishops and king, the available space of the enemy king will be systematically reduced, until it is driven into a corner. Then the decisive mating attack will follow. White’s king will play a “leading role” – occupying space and spear-head its “units”.