Discovered Check

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A Discovered Check is a X-ray related chess tactic, revealed when one piece moves out of the way of a sliding piece ray, discovering an attack to the opponent king. Discovered checks can be extremely powerful, as the piece moved can make a threat independently of the check giving piece it reveals, including the double check. Pieces potentially able to discover a check can be determined almost with the same method along with a union set of pinned pieces, which might be separated by piece color later.

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