What Is X-Ray Attack in Chess?
An X-ray attack is when a piece exerts pressure through an enemy piece, targeting what's behind it on the same line.
Definition
An X-ray attack (also called an X-ray defense or transparency tactic) occurs when a piece attacks through an enemy piece on the same rank, file, or diagonal. The most common form is a queen or rook 'seeing through' an enemy queen to attack or defend beyond it. This often creates pins, exploits weaknesses, or defends key squares from a distance.
Example
White's rook on a1 aims at the Black queen on a5. Behind the queen sits the Black king on a8. If the queen moves, the king is in check — the rook was using X-ray vision through the queen. This can prevent the queen from capturing a piece on a5 because doing so would bring her onto the rook's line of fire.
Why It Matters for Your Chess
X-ray vision is a concept experienced players use constantly when working out which squares are truly safe. Before moving a piece onto a square, make sure no enemy piece is 'seeing through' another piece to attack it.
Frequently Asked Questions
Is x-ray a common tactic?
It appears more often in endgames (where pieces are less cluttered) and in queen endings. It's an important concept for understanding why certain squares are not as safe as they appear.
Practice X-Ray Attack in Your Games
FireChess detects tactical patterns like x-ray attack in your games and shows you exactly what you missed — and how to find them next time.
Related Terms
Pin
A pin is a tactic where a piece is immobilized because moving it would expose a more valuable piece behind it to capture.
Skewer
A skewer is the reverse of a pin — a valuable piece is attacked directly and must move, exposing a less valuable piece behind it to capture.
Discovered Attack
A discovered attack is unleashed when one piece moves and unmasks an attack from a piece behind it — often winning material or giving check.
Battery
A battery is when two major pieces (two rooks, queen and rook, or queen and bishop) are lined up on the same file, rank, or diagonal — doubling their attacking power.