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Created page with " '''Home * Chess * Draw * Fifty-move Rule''' The '''Fifty-move rule''' states that a game of chess is considered drawn after '''f..."
'''[[Main Page|Home]] * [[Chess]] * [[Draw]] * Fifty-move Rule'''
The '''Fifty-move rule''' states that a [[Chess Game|game of chess]] is considered [[Draw|drawn]] after '''fifty''' consecutive [[Moves|full moves]] without a [[Captures|capture]] or a [[Pawn Push|pawn move]]. If the last move of such series delivers a [[Checkmate|checkmate]], this takes precedence over the 50 move rule. Inside a chess program, the [[Halfmove Clock|halfmove clock]] takes care of enforcing fifty-move rule. If the halfmove clock becomes greater or equal than 100, and the [[Side to move|side to move]] has at least one [[Legal Move|legal move]], a [[Score#DrawScore|draw score]] should be assigned to that [[Node|node]], with appropriate [[Protocols|protocol]] handling and [[Chess Game#endofgame|game state]] transitions, if the node is already the [[Root|root]] and there is no mate in one.
=Fide Rule=
9.3 The game is drawn, upon a correct claim by the player having the move, if <ref>[http://www.fide.com/component/handbook/?id=124&view=article Fide Handbook - E.I.01A. Laws of Chess]</ref>
a) he writes his move on his [[Game Notation|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 <ref>[http://www.talkchess.com/forum/viewtopic.php?t=53030 FIDE's new rules for chess] by [[Mark Lefler]], [[CCC]], July 20, 2014</ref>
9.6 If one or both of the following occur(s) then the game is drawn:
a) the same position has appeared, as in [[Repetitions#92b|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 [[Endgame|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=
* [[Draw]]
* [[Endgame Tablebases#DTZ50|Endgame Tablebases | DTZ50 - Depth to Zeroing in the context of the Fifty-move Rule]]
* [[Graph History Interaction]] (GHI)
* [[Halfmove Clock]]
* [[Path-Dependency]]
* [[Repetitions]]
* [[Transposition]]
* [[Transposition Table]]
=Publications=
* [[John Roycroft]] ('''1984'''). ''A Proposed Revision of the ‘50-Move Rule’''. [[ICGA Journal#7_3|ICCA Journal, Vol. 7, No. 3]]
* [[Bob Herschberg]], [[Jaap van den Herik]] ('''1993'''). ''Back to fifty''. [[ICGA Journal#16_1|ICCA Journal, Vol. 16, No. 1]]
* [[Galen Huntington]], [[Guy Haworth]] ('''2015'''). ''Depth to Mate and the 50-Move Rule''. [[ICGA Journal#38_2|ICGA Journal, Vol. 38, No. 2]] » [[Endgame Tablebases]] <ref>[http://galen.metapath.org/egtb50/ Endgame tablebases with the fifty-move rule] by [[Galen Huntington]]</ref>
=Forum Posts=
==1998 ...==
* [https://www.stmintz.com/ccc/index.php?id=18139 Horrible move!] by [[Tony Hedlund]], [[CCC]], May 07, 1998 » [[Hiarcs]]
* [https://www.stmintz.com/ccc/index.php?id=49261 50 move rule question] by [[Uri Blass]], [[CCC]], April 20, 1999
==2000 ...==
* [https://www.stmintz.com/ccc/index.php?id=280707 Question about 50 move rule and e.p./castle flags] by [[Sune Fischer]], [[CCC]], January 31, 2003
==2010 ...==
* [http://www.talkchess.com/forum/viewtopic.php?t=40388 Repetitions/50 moves and TT] by [[Sergei Markoff]], [[CCC]], September 13, 2011
* [http://www.talkchess.com/forum/viewtopic.php?t=44167 Texel recipe to fix TT draws scores] by [[Marco Costalba]], [[CCC]], June 23, 2012 » [[Texel]]
* [http://www.talkchess.com/forum/viewtopic.php?t=45556 Draw by 50 move rule or mate] by [[Harald Lüßen]], [[CCC]], October 13, 2012
* [http://www.open-chess.org/viewtopic.php?f=3&t=2209 Half Move Clock Confusion] by HumbleProgrammer, [[Computer Chess Forums|OpenChess Forum]], January 10, 2013 » [[Halfmove Clock]], [[Repetitions]]
* [http://www.talkchess.com/forum/viewtopic.php?t=53030 FIDE's new rules for chess] by [[Mark Lefler]], [[CCC]], July 20, 2014
==2015 ...==
* [http://www.talkchess.com/forum/viewtopic.php?t=55633 The 75 move rule] by [[Steven Edwards]], [[CCC]], March 11, 2015
* [http://www.talkchess.com/forum/viewtopic.php?t=60264 Hashtable and 50 move rule draws] by [[Stan Arts]], [[CCC]], May 24, 2016 » [[Transposition Table]]
* [https://groups.google.com/d/msg/fishcooking/M2bkzC3MuFQ/N3pHK4DcAgAJ The new chess rules (5-fold repetition and 75-move draw)] by [[Lyudmil Antonov]], [[Computer Chess Forums|FishCooking]], November 29, 2016 » [[Stockfish]], [[Repetitions]]
* [http://www.talkchess.com/forum/viewtopic.php?t=62956 Have engines updated for fide 2014 draw rules?] by [[Norm Pollock]], [[CCC]], January 28, 2017
* [http://www.open-chess.org/viewtopic.php?f=5&t=3093 Losing by draw] by Hamfer, [[Computer Chess Forums|OpenChess Forum]], March 17, 2017
* [http://www.talkchess.com/forum/viewtopic.php?t=64853 Fifty move counter and Null move] by Tamás Kuzmics, [[CCC]], August 09, 2017 » [[Halfmove Clock]], [[Null Move Pruning]]
=External Links=
* [https://en.wikipedia.org/wiki/Fifty-move_rule Fifty-move rule from Wikipedia]
* [http://www.fide.com/component/handbook/?id=124&view=article Fide Handbook - E.I.01A. Laws of Chess]
* [http://galen.metapath.org/egtb50/ Endgame tablebases with the fifty-move rule] by [[Galen Huntington]]
=References=
<references />
'''[[Draw|Up one Level]]'''
