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Razoring

414 bytes added, 20:31, 6 November 2020
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==Strelka==
Similar code appears in [[Jury Osipov|Jury Osipov's]] [[:Category:Open Source Engines|open source engine]] [[Strelka|Strelka 2.0]] <ref>[http://www.sdchess.ru/download_engines.htm Download] by [http://www.sdchess.ru/ sdchess.ru]</ref> , failing a bit harder. The interesting thing is the missing <span style="background-color: #d6d6d6;">new_value < beta</span> condition in the <span style="background-color: #d6d6d6;">depth = 1</span> case. If the static [[Evaluation|evaluation]] indicates a [[Node Types#ALL|fail-low node]], but q-search [[Fail-High|fails high]], the score of the reduced fail-high search is returned, since there was obviously a winning capture raising the score, and one assumes a [[Quiet Moves|quiet move]] near the horizon will not do better <ref>[http://groups.google.com/group/rec.games.chess.computer/browse_frm/thread/8695c3373be2b379# Razoring] by [[Joe Stella]], [[Computer Chess Forums|rgcc]], August 31, 1995</ref> .
''Strelka.c line 393'' (slightly modified for clarification) [[user:GerdIsenberg]]
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In the [[Computer Chess Forums|Rybka Forum]] thread on [[Strelka|Strelka 2.0]] <ref>[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=3006 Strelka 2.0] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], January 11, 2008</ref> , [[Anthony Cozzie]] states on this feature <ref>[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=3006;pg=4 Strelka 2.0 pg 4] by [[Anthony Cozzie]], [[Computer Chess Forums|Rybka Forum]], January 11, 2008</ref> :
{| class="wikitable"|-| I'm also pretty amazed at how aggressively the search prunes. Not only will Strelka drop straight into the q-search on a depth-3 search, but because it orders all captures first, it will reduce almost all noncapture/check moves. |}
=See also=
* [http://www.talkchess.com/forum/viewtopic.php?t=57287 Razoring vs Futility pruning] by [[Shawn Chidester]], [[CCC]], August 16, 2015 » [[Futility Pruning]]
* [http://www.talkchess.com/forum/viewtopic.php?t=57843 Verification of pruning techniques] by [[Shawn Chidester]], [[CCC]], October 04, 2015 » [[Pruning]]
==2020 ...==
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=72857 Is razoring useless in modern engines ?] by [[Alayan Feh]], [[CCC]], January 20, 2020
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=74425 Questions on Razoring and Code Structure for Pruning] by Cheney, [[CCC]], July 09, 2020 » [[Pruning]]
=External Links=
* [https://en.wikipedia.org/wiki/Philishave Philishave from Wikipedia]
* [https://en.wikipedia.org/wiki/Occam%27s_razor Occam's razor from Wikipedia]
* [[Videos#FrankZappa:Category:Frank Zappa|Frank Zappa]] - [http://wiki.killuglyradio.com/wiki/Occam%27s_Razor Occam's Razor] from [https://en.wikipedia.org/wiki/One_Shot_Deal One Shot Deal], [https://en.wikipedia.org/wiki/YouTube YouTube] Video: [[Videos#FrankZappa:Category:Frank Zappa|Frank Zappa]], [https://en.wikipedia.org/wiki/Warren_Cuccurullo Warren Cuccurullo], [https://wiki.killuglyradio.com/wiki/Denny_Walley Denny Walley], [https://en.wikipedia.org/wiki/Ike_Willis Ike Willis], [https://en.wikipedia.org/wiki/Tommy_Mars Tommy Mars], [https://en.wikipedia.org/wiki/Peter_Wolf_%28producer%29 Peter Wolf], [https://en.wikipedia.org/wiki/Arthur_Barrow Arthur Barrow], [[Videos#VinnieColaiuta:Category:Vinnie Colaiuta|Vinnie Colaiuta]], [https://en.wikipedia.org/wiki/Ed_Mann Ed Mann]
: {{#evu:https://www.youtube.com/watch?v=dp93bcp4HCM|alignment=left|valignment=top}}
'''[[Reductions|Up one Level]]'''
[[Category:Ban Quotes]]
[[Category:Cozzie Quotes]]
[[Category:Vinnie Colaiuta]]
[[Category:Frank Zappa]]

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