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'''[[Main Page|Home]] * [[Search]] * Principal Variation Search'''
[[FILE:Cage-variations-iii-14-small.jpg|border|right|thumb|link=https://en.wikipedia.org/wiki/File:Cage-variations-iii-14-small.jpg|[[Arts#:Category:John Cage|John Cage]] - Variations III, No. 14 <ref>[https://en.wikipedia.org/wiki/File:Cage-variations-iii-14-small.jpg Variations III, No. 14], a 1992 print by [[Arts#:Category:John Cage|John Cage]] from a series of 57, [https://en.wikipedia.org/wiki/John_Cage John Cage from Wikipedia] [https://en.wikipedia.org/wiki/Fair_use Fair use]</ref> ]]
'''Principal Variation Search (PVS)''',<br/>
=PVS and Aspiration=
When implementing PVS together with the [[Aspiration Windows|aspiration window]], one must be aware that in this case also a normal window search might fail, leaving the program with no move and no PV. (Actually this is the reason why I wrote "When we already have a PV move" and not "searching later moves").
* [[PVS and aspirationAspiration]]
A state of the art [[Fail-Soft|fail-soft]] PVS implementation, called without aspiration, was posted by [[Vincent Diepeveen]] inside the mentioned [[CCC]] thread <ref>[http://www.talkchess.com/forum/viewtopic.php?topic_view=threads&p=255191&t=26974 Re: PVS] by [[Vincent Diepeveen]], [[CCC]], March 14, 2009</ref> :
* [[NegaScout]]
* [[Null Window]]
* [[PVS and aspirationAspiration]]
* [[Scout]]
* [http://www.open-chess.org/viewtopic.php?f=5&t=2218 Implementing pvs] by [[Christian Daley|CDaley11]], [[Computer Chess Forums|OpenChess Forum]], January 13, 2013
* [http://www.talkchess.com/forum/viewtopic.php?t=53626 Improvement from PVS] by [[Matthew Lai]], [[CCC]], September 09, 2014
* [http://www.talkchess.com/forum/viewtopic.php?t=53972 Your experience with PVS + Aspiration window] by [[Fabio Gobbato]], [[CCC]], October 07, 2014 » [[Aspiration Windows]], [[PVS and aspirationAspiration]]
==2015 ...==
* [http://www.talkchess.com/forum/viewtopic.php?t=55709 Question on standard implementation of PVS+NWS] by Rob Williamson, [[CCC]], March 19, 2015
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