In the game of chess, perpetual check is a situation in which one player can force a draw by an unending series of checks. Such a situation typically arises when the player who is checking cannot deliver checkmate; while failing to continue the series of checks gives the opponent at least a chance to win. A draw by perpetual check is no longer one of the rules of chess. However, such a situation will eventually result in a draw by either threefold repetition or the fifty-move rule, but usually players agree to a draw (Burgess 2000:478).
Perpetual check can also occur in other chess variants, although the rules relating to it may be different. For example, giving perpetual check is not allowed (an automatic loss for the giver) in both shogi and xiangqi.
Famous quotes containing the words perpetual and/or check:
“I allude to these facts to show that, so far from the Supper being a tradition in which men are fully agreed, there has always been the widest room for difference of opinion upon this particular. Having recently given particular attention to this subject, I was led to the conclusion that Jesus did not intend to establish an institution for perpetual observance when he ate the Passover with his disciples; and further, to the opinion that it is not expedient to celebrate it as we do.”
—Ralph Waldo Emerson (1803–1882)
“Unless you become more watchful in your states and check the spirit of monopoly and thirst for exclusive privileges you will in the end find that ... the control over your dearest interests has passed into the hands of these corporations.”
—Andrew Jackson (1767–1845)