Rule

What Is Check in Chess?

Check is a direct attack on the king that must be answered immediately.

Definition

A king is in check when an enemy piece attacks the square it stands on. Check must be dealt with straight away — you cannot ignore it or make an unrelated move. There are exactly three legal answers: move the king to a safe square, block the attacking line with another piece, or capture the checking piece. Against a double check only the first option works.

Example

A white queen arrives on h5 with a clear line to a black king on e8. Black must respond immediately: block with a piece on f7 or g6, capture the queen if possible, or move the king. Playing a developing move elsewhere is simply illegal.

How to spot it

  • After any opponent move, ask first whether your king is attacked.
  • A checking move by a knight cannot be blocked — only capture or king move.
  • You may never move into check, and you may never leave your king in check.
  • Checks are the most forcing moves in chess — always calculate them first.

The mistake most players make

Giving check just because it is available. A pointless check often drives the enemy king somewhere safer and loses a tempo — check when it achieves something concrete.

Frequently asked questions

What are the three ways to get out of check?

Move the king to a square that is not attacked, block the line between the checking piece and your king, or capture the checking piece. Against a knight check blocking is impossible, and against a double check only moving the king works.

Do you have to say check in chess?

No. Announcing check is a common courtesy in casual games but it is not required by the rules, and it is not done in tournament play. The player is expected to notice the check themselves.

Related terms

  • Stalemate — Stalemate is when the player to move has no legal move and is not in check — the game is an immediate draw.
  • Discovered check — A discovered check is a discovered attack where the unveiled piece gives check, forcing an immediate response.
  • Back-rank mate — A back-rank mate is checkmate delivered along the first or eighth rank against a king trapped behind its own unmoved pawns.
  • Castling — Castling moves the king two squares toward a rook and jumps the rook to the king's other side — the only move where two pieces move at once.

Practise this pattern

Definitions stick once you have seen the pattern in a real game. Solve tactics puzzles to train recognition, review one of your games to find where it came up, or ask the coach to explain it in a position you are looking at.