Discovered Attack
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A Discovered Attack 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 squares, opponent pieces or the king, the latter case called a Discovered Check. Discovered attacks can be extremely powerful, as the piece moved can make a threat independently of the piece it reveals.
During move generation or move ordering, one may encourage discovering moves by considering origin squares attacked by an own sliding pieces, as well as the resulting attacking direction.