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corresponding squares
Corresponding squares (also called relative squares, sister squares and coordinate squares ) in chess occur in some chess endgames, usually ones that are mostly blocked. If squares ''x'' and ''y'' are corresponding squares, it means that if one player moves to ''x'' then the other player must move to ''y'' in order to hold his position. Usually there are several pairs of these squares, and the members of each pair are labeled with the same number, e.g. 1, 2, etc. In some cases they indicate which square the defending king must move to in order to keep the opposing king away. In other cases, a maneuver by one king puts the other player in a situation where he cannot move to the corresponding square, thus the first king is able to penetrate the position . The theory of corresponding squares is more general than opposition, and is more useful in cluttered positions.
==Details==
Corresponding squares are squares of reciprocal (or mutual) zugzwang. They occur most often in king and pawn endgames, especially with triangulation, opposition, and mined squares. A square that White can move to corresponds to a square that Black can move to. If one player moves to such a square, the opponent moves to the corresponding square to put the opponent in zugzwang .
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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