Fifty-move+Rule

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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= : > > ||

Since July 01, 2014
Since July 01, 2014 75 moves without capture and pawn move end the game even without a claim > >  ||

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=
 * Draw
 * 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’//. ICCA Journal, Vol. 7, No. 3
 * Bob Herschberg, Jaap van den Herik (**1993**). //Back to fifty//. ICCA Journal, Vol. 16, No. 1
 * Galen Huntington, Guy Haworth (**2015**). //Depth to Mate and the 50-Move Rule//. ICGA Journal, Vol. 38, No. 2 » Endgame Tablebases

=Forum Posts=

1998 ...

 * [|Horrible move!] by Tony Hedlund, CCC, May 07, 1998 » Hiarcs
 * [|50 move rule question] by Uri Blass, CCC, April 20, 1999

2000 ...

 * [|Question about 50 move rule and e.p./castle flags] by Sune Fischer, CCC, January 31, 2003

2010 ...

 * [|Repetitions/50 moves and TT] by Sergei Markoff, CCC, September 13, 2011
 * [|Texel recipe to fix TT draws scores] by Marco Costalba, CCC, June 23, 2012 » Texel
 * [|Draw by 50 move rule or mate] by Harald Lüßen, CCC, October 13, 2012
 * [|Half Move Clock Confusion] by HumbleProgrammer, OpenChess Forum, January 10, 2013 » Halfmove Clock, Repetitions
 * [|FIDE's new rules for chess] by Mark Lefler, CCC, July 20, 2014

2015 ...

 * [|The 75 move rule] by Steven Edwards, CCC, March 11, 2015
 * [|Hashtable and 50 move rule draws] by Stan Arts, CCC, May 24, 2016 » Transposition Table
 * [|The new chess rules (5-fold repetition and 75-move draw)] by Lyudmil Antonov, FishCooking, November 29, 2016 » Stockfish, Repetitions
 * [|Have engines updated for fide 2014 draw rules?] by Norm Pollock, CCC, January 28, 2017
 * [|Losing by draw] by Hamfer, OpenChess Forum, March 17, 2017
 * [|Fifty move counter and Null move] by Tamás Kuzmics, CCC, August 09, 2017 » Halfmove Clock, Null Move Pruning

=External Links=
 * [|Fifty-move rule from Wikipedia]
 * [|Fide Handbook - E.I.01A. Laws of Chess]
 * [|Free Accounting Course: Bean Counting 101]
 * [|Endgame tablebases with the fifty-move rule] by Galen Huntington

=References= =What links here?= include page="Fifty-move Rule" component="backlinks" limit="80"
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