X-ray (chess)

Chess tactic where a tactic where a piece indirectly attacks an enemy piece through another piece or defends a friendly piece through an enemy piece

In chess, an X-ray or X-ray attack is a tactic where a piece indirectly controls a square from the other side of an intervening piece. Generally, a piece performing an X-ray either: effects a skewer, indirectly attacks an enemy piece through another piece or pieces, or defends a friendly piece through an enemy piece.