What is perpetual check?

Perpetual Check

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).

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Some articles on perpetual check:

Draw (chess) - Draws in All Games
... the player on turn has no legal move but is not in check, this is stalemate and the game is automatically a draw ... It is popularly considered that perpetual check – where one player gives a series of checks from which the other player cannot escape – is a draw, but in fact there is no longer a ... By 1965 perpetual check was no longer in the official rules (Harkness 1967) ...
Perpetual Check - History
... The earliest example of perpetual check contained in it is a game played by two unknown players in 1750 N.N ... Levy O'Connell 19819) The next examples of perpetual check in the book are two games, both ending in perpetual check, played in 1788 between Bowdler and Philidor, with Philidor giving odds of pawn and move ... A draw by perpetual check used to be in the rules of chess (Reinfeld 1954175), (Reinfeld 195841–43) ...

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