Null Move

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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:


 * Botvinnik-Markoff Extension
 * Double Null Move
 * Fail-High Reductions
 * Mate Threat Extensions
 * Null Move Observation
 * Null Move Pruning
 * Null Move Reductions
 * Threat Detection

=See also=
 * Best Move
 * Hash Move
 * Killer Move
 * Refutation Move

=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

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