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A null move or passing move is invalid in Chess. Nevertheless, chess programs often apply a null move inside their search algorithm for various reasons and applications:

See also

Forum Posts

Null move in PV by Harm Geert Muller, CCC, July 18, 2012 » Principal Variation
tt move vs null move by Erin Dame, CCC, May 27, 2017 » Hash Move
Fifty move counter and Null move by Tamás Kuzmics, CCC, August 09, 2017 » Fifty-move Rule, Null Move Pruning

What links here?

Page	Date Edited
B*	Nov 27, 2017
CAPS	Dec 23, 2017
Check	Feb 1, 2018
Color Flipping	May 17, 2017
Delicate Brute	Jun 7, 2016
Double Null Move	May 8, 2015
Engine Testing	Feb 1, 2018
Erin Dame	Dec 2, 2017
Eugen	Jan 7, 2016
Hash Move	Oct 4, 2017
Horizon	Mar 17, 2013
Knowledge	Jul 22, 2017
LChess	Jan 7, 2016
List (Program)	Jan 7, 2016
Mate Threat Extensions	Apr 14, 2012
Mater	Apr 26, 2016
Merlin	Jan 20, 2018
Moves	Feb 19, 2018
Node Types	Oct 22, 2017
Null Move	Aug 9, 2017
Null Move Observation	Dec 30, 2015
Null Move Pruning	Dec 2, 2017
Null Move Reductions	Jun 22, 2015
Onno	Jul 19, 2013
Phoenix	May 8, 2017
Principal variation	Dec 4, 2017
Quiescence Search	Aug 19, 2017
Quiet Moves	Mar 4, 2010
Reverse Futility Pruning	Jun 2, 2017
Side to move	Oct 29, 2017
Thomas Thomsen	Mar 25, 2015
Threat Move	Sep 10, 2017
Triangulation	Apr 4, 2013
Woodpusher	Dec 12, 2016
Ziggurat	Oct 9, 2017
Zzzzzz	May 14, 2016

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