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.

Category
Tactics
Difficulty
Intermediate
Also known as
clearance sacrifice, line clearance, unblocking, clearing move, vacating move

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.

The central idea is the removal of self-obstruction. A rook or queen may be staring at its own piece; once that piece leaves, the heavy piece gains scope and creates threats that did not exist a move earlier. Clearance is frequently seen together with discovered attacks, yet the two ideas remain distinct: clearance focuses on the act of unblocking, while the discovery is the attack that appears once the line is open.

Clearance occurs on files, ranks, and diagonals. A rook may slide sideways or forward with check to vacate a square for the queen. A bishop or knight may step aside to let a rook or queen swing into action along a newly opened diagonal or file. The motif can be quiet or sacrificial; in the latter case the clearing piece is deliberately offered so that its capture (or the need to meet its threat) keeps the opponent from stopping the newly opened line.

To spot clearance, look for a rook or queen aligned behind a friendly piece on an open or half-open line. The clearing move itself often carries the real force because it arrives with check or a direct threat, leaving the opponent no time to block or capture the newly activated piece.

Frequently asked questions

What is clearance in chess?
Clearance is a tactic in which one piece moves off a line or square so a stronger piece behind it, usually a rook or queen, suddenly gains full scope along that line.
How does clearance differ from a discovered attack?
Clearance is the unblocking move itself, while the discovered attack is the threat that appears once the line opens; the two ideas often occur together but are distinct.
Can clearance involve a sacrifice?
Yes, the clearing piece is sometimes offered as a sacrifice so that its capture or the need to meet its threat prevents the opponent from stopping the newly opened line.
Which pieces typically perform or benefit from clearance?
A rook or queen usually benefits from the opened line, while any piece may move aside to clear it, often with check or another tempo-gaining threat.

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.
  • Decoy — A decoy is a tactic that lures an opponent’s piece onto a particular square, often exposing it to capture or diverting it from defending a more important target.
  • 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.
  • Discovered Check — A discovered check occurs when one piece moves aside, revealing an attack on the enemy king from a second piece positioned behind it on the same line.
  • Discovery — A discovery is a tactic in which one piece moves off a line, uncovering an attack from a second piece stationed behind it.

Referenced by

  • Decoy Sacrifice — A decoy sacrifice offers material to lure an enemy piece onto a specific square where it becomes vulnerable to attack or loses its defensive role.

Written by Chesswick.

Reviewed by Benjamin Himmel.

Published
Last updated

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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