X-Ray Attack
An X-ray attack occurs when a piece attacks through an opposing piece to threaten a more valuable target behind it on the same rank, file or diagonal.
- Category
- Tactics
- Also in
- Strategy
- Difficulty
- Intermediate
- Also known as
- X-ray, Xray, X ray, X-ray tactic
X-ray attack
An x-ray attack occurs when one of your pieces exerts pressure along a file, rank or diagonal through an enemy piece toward a more valuable target behind it. The front piece acts as a temporary screen; once it moves or is captured, the real target is exposed.
The effect resembles a skewer, yet the emphasis lies on the line of sight rather than an immediate capture. The attacker does not need to take the screening piece at once. The mere threat along the line often forces the opponent into awkward concessions.
Consider a rook on the d-file with an enemy knight on d5 and the enemy queen on d8. The rook already “sees” the queen through the knight. If the knight moves away, the queen is attacked. If the opponent ignores the situation, you may be able to capture the knight with check or gain material after the knight is forced to move.
X-rays appear most often in the middlegame on open or half-open files. Rooks and queens create them most frequently, though bishops can produce them on diagonals. The key diagnostic is two enemy pieces lined up on the same straight line with one of your long-range pieces behind them.
Defensively, you can block the line, move the rear piece to safety, or reinforce the front piece so that its capture would lose material. The tactic gains power when the screening piece is itself attacked or pinned, limiting the opponent’s options for resolving the pressure.
Frequently asked questions
- What is an X-ray attack in chess?
- An X-ray attack occurs when a piece pressures a more valuable enemy target through an intervening enemy piece on the same rank, file, or diagonal. The front piece acts as a temporary screen that may move or be captured later.
- How does an X-ray attack differ from a skewer?
- An X-ray focuses on the ongoing line of pressure and the threat it creates rather than an immediate capture of the front piece. A skewer typically forces the front piece to move and exposes the rear piece for capture right away.
- Which pieces most often create X-ray attacks?
- Rooks and queens produce most X-rays on open or half-open files, while bishops can create them along diagonals. The tactic requires two enemy pieces aligned with one of your long-range pieces behind them.
- How can a player defend against an X-ray attack?
- Defenses include blocking the line, moving the rear piece to safety, or reinforcing the front piece so that capturing it does not expose the more valuable target. The threat alone often forces awkward concessions from the opponent.
About the reviewer
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.