Discovery

A discovery is a tactic in which one piece moves off a line, uncovering an attack from a second piece stationed behind it.

Category
Tactics
Difficulty
Intermediate
Also known as
Discovered attack, Discovered check, Discovered double check, Discovery tactic

Discovery is a tactic in which one piece moves away from a line, revealing an attack from a second piece that was positioned behind it. The moving piece often creates a threat of its own, forcing the opponent to respond to two problems at once.

The power of the tactic comes from the fact that the opponent can usually address only one threat per move. If the discovered attack is also a check, the situation becomes especially dangerous.

How the tactic works

Imagine two white pieces aligned on the same file, rank, or diagonal, with a black piece or the black king in their path. When the front piece moves, the rear piece suddenly attacks through the newly opened line. The moving piece can capture material, give check, or create a new threat, compounding the pressure.

Discovered check

A discovered check occurs when the rear piece attacks the enemy king. The opponent must resolve the check before dealing with any secondary threat created by the moving piece. This form is often decisive because the king is under direct attack.

Discovered attack

When the rear piece targets a piece other than the king, the result is a discovered attack. The moving piece frequently captures an undefended unit or creates a fork while the rear piece wins material on the newly opened line.

A typical example arises in the Italian Game after 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nxd5 6.Nxf7. Here the knight moves, uncovering an attack from the bishop on c4 against the black queen. Black must resolve the check to the king while the queen is also threatened.

{"v":1,"type":"board","orientation":"black","fen":"r1bqkb1r/ppp2Npp/2n5/3np3/2B5/8/PPPP1PPP/RNBQK2R b KQkq - 0 6","arrows":[{"from":"c4","to":"f7","color":"good"},{"from":"f7","to":"d8","color":"good"}],"highlights":[{"square":"f7","color":"focus"}],"caption":"White plays Nxf7, discovering an attack on the queen while checking the king.","alt":"Position after 6.Nxf7. The white knight on f7 checks the black king and uncovers the bishop on c4 attacking the queen on d8."}

Mastery of discoveries requires noticing aligned pieces and calculating the consequences when the front piece moves. The tactic appears frequently in open positions where bishops, rooks, and queens can exert long-range pressure once lines are cleared.

Frequently asked questions

What is a discovery in chess?
A discovery is a tactic in which one piece moves off a line, uncovering an attack from a second piece stationed behind it on the same file, rank, or diagonal.
What is the difference between a discovered check and a discovered attack?
A discovered check occurs when the rear piece attacks the enemy king, while a discovered attack targets any other enemy piece. The discovered check is usually more forcing because the opponent must resolve the check first.
How does a discovery create two threats at once?
The moving piece often creates its own threat, such as capturing material or giving check, while the newly opened line produces a second attack that the opponent can address only one at a time.
Which pieces are most commonly used to execute a discovery?
Bishops, rooks, and queens serve as the rear attacking piece because they operate along lines, with any piece able to act as the moving front piece that clears the path.

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.
  • 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.
  • Double Check — A double check occurs when two pieces simultaneously check the enemy king, most often via a discovered check in which the moving piece also attacks the king.
  • 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.

Referenced by

  • Tactic Goblin — A tactic goblin is an intermediate player who habitually searches for forcing sequences such as forks, pins, and discoveries to gain material or initiative, often prioritizing calculation over positional planning.

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…

Read full profile