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Created page with "'''Home * Search * Selectivity * Pruning * Null Move Pruning * Test Results''' '''Home * Engine Testing * Null Move Pruning Te..."
'''[[Main Page|Home]] * [[Search]] * [[Selectivity]] * [[Pruning]] * [[Null Move Pruning]] * Test Results'''
'''[[Main Page|Home]] * [[Engine Testing]] * Null Move Pruning Test Results'''
Here you can find some experimental [[Engine Testing#TestResults|test results]] on [[Null Move Pruning]] by varying [[Depth Reduction R|R]] on [[Depth]] and other features.
=Increasing R With Depth=
==Mark Lefler==
One scheme tested by [[Mark Lefler]] on 25 October 2007 is as follows:
<pre>
R=3;
if (side to move has 2 or more pieces) and (depth>7) then R=4;
</pre>
In a 100 game 1/1 match between [[Now]] with and without this change, the change was worth just over 50 [https://en.wikipedia.org/wiki/Elo_rating_system Elo]. I am now testing against other programs. Followup testing showed only about a 20 Elo gain, with about 100 games against a variety of opponents. Within the error of testing.
=See also=
* [[Late Move Reduction Test Results]]
* [[Null Move Test-Positions]]
=Forum Posts=
* [http://www.talkchess.com/forum/viewtopic.php?t=28561 verified null move] by [[Robert Hyatt]], [[CCC]], June 21, 2009
* [http://www.talkchess.com/forum/viewtopic.php?t=32152 my first cluster test result with R] by [[Daniel Shawul]], [[CCC]], January 29, 2010
* [http://www.open-chess.org/viewtopic.php?f=3&t=435 value of LMR and null-move] by [[Robert Hyatt]], [[Computer Chess Forums|OpenChess Forum]], July 12, 2010
* [http://www.talkchess.com/forum/viewtopic.php?p=367283 Extended Null-Move Reductions] by [[Alvaro Cardoso]], [[CCC]], August 20, 2010
'''[[Null Move Pruning|Up one level]]'''
'''[[Main Page|Home]] * [[Engine Testing]] * Null Move Pruning Test Results'''
Here you can find some experimental [[Engine Testing#TestResults|test results]] on [[Null Move Pruning]] by varying [[Depth Reduction R|R]] on [[Depth]] and other features.
=Increasing R With Depth=
==Mark Lefler==
One scheme tested by [[Mark Lefler]] on 25 October 2007 is as follows:
<pre>
R=3;
if (side to move has 2 or more pieces) and (depth>7) then R=4;
</pre>
In a 100 game 1/1 match between [[Now]] with and without this change, the change was worth just over 50 [https://en.wikipedia.org/wiki/Elo_rating_system Elo]. I am now testing against other programs. Followup testing showed only about a 20 Elo gain, with about 100 games against a variety of opponents. Within the error of testing.
=See also=
* [[Late Move Reduction Test Results]]
* [[Null Move Test-Positions]]
=Forum Posts=
* [http://www.talkchess.com/forum/viewtopic.php?t=28561 verified null move] by [[Robert Hyatt]], [[CCC]], June 21, 2009
* [http://www.talkchess.com/forum/viewtopic.php?t=32152 my first cluster test result with R] by [[Daniel Shawul]], [[CCC]], January 29, 2010
* [http://www.open-chess.org/viewtopic.php?f=3&t=435 value of LMR and null-move] by [[Robert Hyatt]], [[Computer Chess Forums|OpenChess Forum]], July 12, 2010
* [http://www.talkchess.com/forum/viewtopic.php?p=367283 Extended Null-Move Reductions] by [[Alvaro Cardoso]], [[CCC]], August 20, 2010
'''[[Null Move Pruning|Up one level]]'''
