Definition:Chess/Rules/In Check
< Definition:Chess | Rules
Jump to navigation
Jump to search
Definition
Uniquely among the chess pieces the king may not legally move into a square which is under attack by a piece of the opposite colour.
That is, a king may not be moved so as to be placed under attack.
If player $a$ moves a piece so as to place the king of player $b$ under attack, then player $b$ is said to be in check.
Player $a$ is then obliged to say "Check."
Player $b$ must make a move so that his or her king is no longer under attack.
Such a move by player $b$ is known as getting out of check.