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
• idea: null-move analogy by Harm Geert Muller, CCC, March 06, 2019 » Null Move Pruning

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