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.

Category
Tactics
Difficulty
Intermediate
Also known as
cross-pin, intersecting pin, double pin

A cross pin is a tactic in which one piece simultaneously pins two enemy units along lines that intersect at the pinning piece itself. Each pinned unit is attacked in a different direction—typically a file and a diagonal, or a rank and a file—so that moving either one exposes the other to capture or violates a more valuable piece behind it.

The power of the cross pin lies in the double obligation it creates. The defender cannot resolve both pins with a single move, often leading to material loss.

Typical geometry

The pinning piece is usually a queen, though a rook or bishop can achieve the same effect when the geometry aligns. The two pinned units stand on separate rays radiating from the pinning piece, and at least one of those rays normally runs toward the enemy king or another high-value target.

Because the lines cross at the attacker, the defender cannot interpose on both lines at once. This forces a choice: abandon one unit or allow the capture of the more important piece behind it.

Example

Consider a position in which a white queen on d4 pins a black rook on d7 against the king on d8 while also pinning a black bishop on a4 along the fourth rank. The rook cannot leave the d-file without exposing the king; the bishop cannot leave the fourth rank without allowing Qxa4. Black must lose one of the two pieces on the next move.

The same pattern appears in many middlegame positions when a queen centralizes and discovers multiple alignments at once. Recognizing the intersecting lines early lets the attacker force the win of material before the opponent can untangle.

Frequently asked questions

What is a cross pin in chess?
A cross pin occurs when one piece pins two enemy units along lines that intersect at the pinning piece itself, typically a file and a diagonal or a rank and a file.
Which pieces can execute a cross pin?
A queen performs most cross pins, though a rook or bishop can succeed when the geometry places the two enemy units on separate rays from the attacker.
Why is a cross pin difficult to meet?
The defender cannot resolve both pins with one move, since interposition or capture on one line leaves the other unit free to be taken or exposes a more valuable piece behind it.
How does a cross pin differ from an ordinary pin?
An ordinary pin attacks one piece against a more valuable unit behind it, while a cross pin creates two such obligations along intersecting lines that cross at the attacker.

See also

  • 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.
  • Fork — A fork is a tactic in which one piece attacks two or more enemy pieces at once, usually winning material because only one threat can be met on the next move.
  • Interference — Interference is a tactical motif in which a piece is placed on a line to obstruct an opponent’s defender from protecting a key square or unit, typically breaking a pin or discovered attack.
  • Pin — A pin occurs when a long-range piece attacks an enemy unit that shields a more valuable piece or the king on the same line, leaving the attacked unit immobilised.
  • Skewer — A skewer is a tactic in which an attacker forces a more valuable enemy piece to move along a shared rank, file, or diagonal, thereby exposing a less valuable piece behind it to capture.
  • 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.

Written by Chesswick.

Reviewed by James Duprey.

Published
Last updated

About the reviewer

James Duprey

James came to chess late, and he'll tell you that's part of the appeal. He picked up the game in his thirties, mostly out of boredom, and found something he wasn't expecting: a puzzle that never quite runs out of new…

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