What Is Double Check in Chess?
A double check is when two pieces simultaneously give check — the king must move since no single capture or block can stop both.
Definition
A double check occurs when a king is attacked by two pieces at the same time, typically produced by a discovered check where the moving piece also gives check. It is the most forcing tactic in chess — the king cannot capture or block (one piece can be captured or blocked, not two), so it must move. Double checks can deliver checkmate in positions that appear otherwise defended.
Example
White plays Nd7+: the knight gives check, and simultaneously uncovers a bishop's check on the king. Two pieces checking at once — the king has nowhere to block or capture and must flee. White follows up with a mating attack.
Why It Matters for Your Chess
Knowing double check patterns helps you find devastating combinations that appear from nowhere. Any time you have a discovered check candidate, ask: can the moving piece also give check at the same time?
Frequently Asked Questions
Can you block a double check?
No. Blocking works against a single check, but a double check comes from two directions simultaneously. The only legal response is to move the king.
Can you capture both checking pieces in a double check?
No. You can only make one move per turn, so you can capture at most one of the checking pieces. The other remains on the board. That's why double check forces the king to move.
Practice Double Check in Your Games
FireChess detects tactical patterns like double check in your games and shows you exactly what you missed — and how to find them next time.
Related Terms
Fork
A fork is a tactic where one piece attacks two or more enemy pieces simultaneously, forcing your opponent to lose material.
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.
Check
Check is when the king is directly attacked by an enemy piece and must be rescued immediately — it is not checkmate until escape is impossible.
Checkmate
Checkmate is the end of the game — the king is in check with no legal move to escape, and the player who delivers it wins.