Home * Chess * Draw * Fifty-move Rule

The Fifty-move rule states that a game of chess is considered drawn after fifty consecutive full moves without a capture or a pawn move. If the last move of such series delivers a checkmate, this takes precedence over the 50 move rule. Inside a chess program, the halfmove clock takes care of enforcing fifty-move rule. If the halfmove clock becomes greater or equal than 100, and the side to move has at least one legal move, a draw score should be assigned to that node, with appropriate protocol handling and game state transitions, if the node is already the root and there is no mate in one.

Fide Rule

[1]:
9.3 The game is drawn, upon a correct claim by the player having the move, if
  • a) he writes his move on his scoresheet, and declares to the arbiter his intention to make this move which shall result in the last 50 moves having been made by each player without the movement of any pawn and without any capture, or
  • b) the last 50 consecutive moves have been made by each player without the movement of any pawn and without any capture.

Since July 01, 2014

Since July 01, 2014 75 moves without capture and pawn move end the game even without a claim [2]
9.6 If one or both of the following occur(s) then the game is drawn:
  • a) the same position has appeared, as in 9.2b, for at least five consecutive alternate moves by each player.
  • b) any consecutive series of 75 moves have been completed by each player without the movement of any pawn and without any capture. If the last move resulted in checkmate, that shall take precedence.

Temporary Exceptions

At the beginning of the nineties, when it has been proven that some endgames can be won only in a larger number of moves, there has been an attempt to complicate the rule with a series of exceptions, all of which has been scraped later on.

See also


Publications


Forum Posts

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External Links


References

  1. ^ Fide Handbook - E.I.01A. Laws of Chess
  2. ^ FIDE's new rules for chess by Mark Lefler, CCC, July 20, 2014
  3. ^ Endgame tablebases with the fifty-move rule by Galen Huntington

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