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.

Category
Tactics
Difficulty
Intermediate
Also known as
double check, double-check, ++

Double check is one of the most forcing situations in chess. It occurs when two pieces simultaneously check the enemy king.

A king in check normally has three escape options: move out of the line of attack, capture a checking piece, or block a line of check. When two separate pieces deliver check at once, capturing or blocking becomes impossible. The defender is left with only the option of moving the king.

Double checks arise most often through a discovered check. One piece moves off a line, uncovering an attack from a piece behind it, while the moving piece itself also checks the king.

Consider this position, reached after White has just played Nf7 in a typical Italian Game line:

{"v":1,"type":"board","orientation":"white","fen":"r1bqk2r/pppp1Npp/2n2n2/4p3/1bB1P3/8/PPPP1PPP/RNBQK2R b KQkq - 0 6","arrows":[{"from":"c4","to":"f7","color":"good"},{"from":"f7","to":"d8","color":"good"}],"highlights":[{"square":"e8","color":"bad"}],"labels":[{"square":"f7","text":"check","color":"good"},{"square":"d8","text":"check","color":"good"}],"caption":"Nf7 creates a double check: the knight attacks the king directly while uncovering the bishop on c4.","alt":"Position after Nf7. White knight on f7 checks the black king on e8. White bishop on c4 also checks through the newly opened line. Two arrows mark the checks; e8 is highlighted as the target."}

The tactic combines a direct check and a line-opening discovery in a single move. Because neither check can be captured or blocked simultaneously, the opponent must resolve both threats by moving the king.

Key takeaways

  • Double check forces the king to move as the sole escape since both checks cannot be captured or blocked.
  • It arises most often from a discovered check where the moving piece also attacks the king.
  • Double check ranks among the most forcing moves because it leaves the defender with no interposition options.

Frequently asked questions

What is a double check in chess?
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.
How does a double check usually arise?
It most often results from a discovered check where the moving piece also delivers check while uncovering an attack from a piece behind it.
Why is double check especially forcing?
The king has only one escape option because capturing or blocking works against only one check at a time.
Can a double check ever be blocked or captured?
No, interposition and capture are impossible against two separate checking pieces, so the king must move.

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.
  • Check — Check occurs when a player's king is under direct attack by an opponent's piece and must be resolved on the next move.
  • 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.
  • 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

  • Body Check — Body check is not a recognized term in standard chess and has no established definition or usage in rules, tactics, theory, or problems.
  • Cc Player — A CC player competes in correspondence chess, exchanging moves by post, email or dedicated servers over days or weeks rather than in a single sitting.

Written by Chesswick.

Reviewed by Benjamin Himmel.

Published
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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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