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discovered attack
In chess, a discovered attack is an attack revealed when one piece moves out of the way of another.〔(Discovered Attack ) Article at Chesscorner.com〕 Discovered attacks can be extremely powerful, as the piece moved can make a threat independently of the piece it reveals. Like many chess tactics, they succeed because the opponent is unable to meet two threats at once. While typically the consequence of a discovered attack is the gain of material, they do not have to do this to be effective; the tactic can be used merely to gain a tempo.〔(More detailed tutorial ) at MarkLowery.net〕 If the discovered attack is a check, it is called a discovered check.
==Types==
When the moving piece gives check to the opponent's king, the maneuver is often described as a ''discovered attack with check''. When the discovered attack is itself a check, it is called a ''discovered check''. If both pieces give check, a double check results.
Discovered attacks—especially checks—can win material when the moving piece captures an opposing piece nominally protected by another opposing piece. If the opponent deals with the discovered attack (obligatory if it is a check), the attacking player will have time to return the moving piece out of harm's way. This scenario is often referred to as a ''discovered attack'' (or ''check'') ''with capture''.
When the moving piece moves to a square from which it threatens to inflict checkmate on the next move, the tactic is called a ''discovered attack with mate threat''. A ''discovered checkmate'' itself is also possible.
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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