X-Ray

An X-ray is a tactical motif where a piece attacks through an enemy unit to control or threaten a square or piece behind it, akin to a skewer.

Category
Tactics
Also in
Strategy
Difficulty
Intermediate
Also known as
X-ray attack, Xray attack, Xray, X-ray tactic

X-ray is a tactical motif in which a piece attacks through an enemy unit to control or threaten a square or piece behind it. The attacking piece effectively “sees through” the intervening enemy piece, creating pressure on the more distant target.

The motif most often occurs with rooks or queens along ranks, files, or diagonals. Unlike a pin, the front enemy piece is not immobilised; unlike a skewer, the goal is not necessarily to force the front piece to move. Instead, the attacker gains influence over the square or piece behind, which can support tactics such as captures, checks, or mate threats.

Typical pattern

Place a white rook on a1, a black knight on a4, and a black queen on a8. The rook attacks through the knight and eyes the queen. If the knight moves or is captured, the queen immediately comes under fire. The same geometry works on diagonals with bishops or queens.

{"v":1,"type":"board","fen":"4k3/8/8/8/n7/8/8/R3K3 w - - 0 1","arrows":[{"from":"a1","to":"a8","color":"good"}],"highlights":[{"square":"a4","color":"neutral"},{"square":"a8","color":"bad"}],"caption":"White’s rook x-rays through the knight to the queen on a8.","alt":"White rook on a1, black knight on a4, black queen on a8. An arrow runs from a1 through a4 to a8, showing the x-ray attack on the queen."}

Practical use

An x-ray often appears in the endgame when a rook supports a passed pawn or attacks an enemy piece that shields the king. In the middlegame it can arise after exchanges on an open file, leaving one side’s heavy piece staring at a target behind an enemy defender. Recognising the geometry helps a player spot latent threats that become real once the intervening piece is removed or distracted.

Frequently asked questions

What is an X-ray in chess?
An X-ray is a tactic in which a piece attacks through an enemy unit to control or threaten a square or piece behind it, effectively seeing through the intervening piece.
How does an X-ray differ from a pin or skewer?
Unlike a pin, the front enemy piece is not immobilized and can move; unlike a skewer, the goal is not to force that piece away to expose the target behind it.
Which pieces most often create X-rays?
Rooks and queens produce X-rays along ranks and files, while bishops and queens do so on diagonals.
What is a typical X-ray pattern?
A common setup places the attacker, an enemy blocker, and a more valuable target on the same line, so that capturing or moving the blocker immediately exposes the rear target.

See also

  • Battery — A battery consists of two or more same-colour pieces aligned on a file, rank or diagonal, with the stronger piece behind, so the front unit can move to unleash the rear piece’s concentrated pressure.
  • Clearance — Clearance is a tactical motif in which a piece moves aside to vacate a square or open a line for a more powerful piece—usually a rook or queen—often gaining tempo by delivering check or creating a threat.
  • Cross Pin — A cross pin is a tactic in which one piece pins two enemy units along intersecting lines, so that either may be captured if it moves.
  • Deflection — Deflection is a tactic that forces an opposing piece to abandon a key square or defensive duty, exposing a weakness the attacker can immediately exploit.
  • Discovered Attack — A discovered attack occurs when one piece moves off a line and uncovers an attack from a second piece standing behind it on the same rank, file or diagonal.
  • Discovery — A discovery is a tactic in which one piece moves off a line, uncovering an attack from a second piece stationed behind it.

Written by Chesswick.

Reviewed by Benjamin Himmel.

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About the reviewer

Benjamin Himmel

Ben's been in love with chess since he was seven years old, when his grandfather taught him the Sicilian Defense on a well-worn board that had traveled through three generations of family game nights.

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