Corridor checkmate - a checkmate in which the enemy King cannot escape from checkmate, because he is locked along a horizontal, line or diagonal (corridor). In this case any long-range piece (Bishop, Rook or Queen) can attack the King. The checkmate on the last horizontal is the Corridor checkmate, but it implies only one variant of staging, at the same time the Corridor checkmate can be staged also by the Bishop (diagram 2).