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'''[[Main Page|Home]] * [[Engines]] * Ktulu'''
[[FILE:Cthulhu and R'lyeh.jpg|border|right|thumb| [https://en.wikipedia.org/wiki/Cthulhu Cthulhu] Artist depiction of Ktulu <ref>An artist's [https://commons.wikimedia.org/wiki/File:Cthulhu_and_R%27lyeh.jpg visual representation] of the Elder God [https://en.wikipedia.org/wiki/Cthulhu Cthulhu], by [https://commons.wikimedia.org/wiki/User:BenduKiwi BenduKiwi], July 30, 2006, [https://en.wikipedia.org/wiki/Wikimedia_Commons Wikimedia Commons]</ref> ]]
'''Ktulu''',<br/>
a commercial [[UCI]] and [[WinBoard]] compatible chess engine by [[Rahman Paidar]] distributed by [[Lokasoft]], but as of July 2020 no longer available <ref>[https://www.lokasoft.nl/ktulu.aspx Ktulu] from [[Lokasoft]] (as of July 2020, no longer available)</ref>.
Ktulu has a sophisticated [[Evaluation|evaluation]] - [[King Safety|King safety]] and [[Passed Pawn|passed pawn]] evaluation,
completely rewritten in version 6.2, are responsible for its dangerous attacking style with strong [[Tactics|tactical]] and positional play.
Further, some unsafe [[Pruning|pruning]] algorithms were replaced with more sound methods
<ref>[https://web.archive.org/web/20110611144445/http://www.playwitharena.com/?Newsticker:Archive_6 Ktulu 6.2 will be released soon], Interview with [[Rahman Paidar]] by [[Frank Quisinsky]], [[Arena|Arena News-Ticker]] 80, March 15, 2005 ([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine])</ref>.
The first version of Ktulu was written in early 2002 in [[Pascal#TurboPascal|Turbo Pascal]] under [[MS-DOS]]. The development of the [[Windows]] version started in summer 2002 <ref>[[Klaus Wlotzka]] ('''2006'''). ''Ktulu 8 - Interview mit Rahman Paidar''. [[Computerschach und Spiele|CSS Online]], [https://computerschach.de/Files/2006/CSS-Rangliste%20-%20Der%20Weltmeister%20im%20Blickpunkt.pdf pdf] (German)</ref>.
=Tournament Play=
Ktulu played four [[CSVN]] tournaments over the board, the [https://en.wikipedia.org/wiki/Leiden Leiden] [[DOCCC 2005]], [[DOCCC 2008]], [[ICT 2009]] and [[DOCCC 2009]], operated by [[Hans Secelle]].Ktulu furher participated at the [[CCT10]], [[CCT11]] and [[CCT12]] online tournaments, the and the [[WCRCC 2007]], - the first [[ACCA World Computer Rapid Chess Championship]].
=Photos & Games=
==Ktulu - Hermann==
[[FILE:KtuluHermannICT2009.jpg|none|border|text-bottom|link=http://www.csvn.nl/index.php?option=com_content&view=article&id=426%3Afotogalerij-3&catid=54%3Afotogalerij&Itemid=61&lang=en640px]] [[ICT 2009]], [[Volker Annuss]] and [[Hans Secelle]], [[Ktulu]] - [[Hermann]] <ref>[http://www.csvn.nl/index.php?option=com_docman&task=cat_view&gid=39&Itemid=26&lang=en Downloads | CSVN International Computerchess Tournament | Games]</ref> <ref>[http://www.csvn.nl/index.php?option=com_content&view=article&id=426%3Afotogalerij-3&catid=54%3Afotogalerij&Itemid=61&lang=en 9th International CSVN Tournament 2009 - Photo Gallery], [[CSVN]] site</ref>
<pre>
[Event "ICT 2009"]
</pre>
==Ktulu - Deep Sjeng==
[[FILE:KtuluSjeng2009.jpg|none|border|text-bottom|640px]]
[[DOCCC 2009]], [[Ktulu]] - [[Deep Sjeng]], [[Gian-Carlo Pascutto]] and [[Hans Secelle]] with [[Computer Chess Compendium]]
<pre>
Rg8 57.Bh7 Bxg7 58.Bxg8 Bc3 59.Bf7 a3 60.Be8+ Kc5 61.Be3+ Kd6 62.Bxb5 a2 0-1
</pre>
=Publications=
* [[Klaus Wlotzka]] ('''2006'''). ''Ktulu 8 - Interview mit Rahman Paidar''. [[Computerschach und Spiele|CSS Online]], [https://computerschach.de/Files/2006/CSS-Rangliste%20-%20Der%20Weltmeister%20im%20Blickpunkt.pdf pdf] (German)
=Forum Posts=
==2003 ==* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=42073 Ktulu Chess by Rahman Paidar] by [[Tim Mann]], [[Computer Chess Forums|Winboard Forum]], April 05, 2003* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=42177 Ktulu and pondering] by [[George Lyapko]], [[Computer Chess Forums|Winboard Forum]], April 11, 2003 » [[Pondering]]* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=42258 Ktulu 3.4 has been released] by [[Jan Kiwitter]], [[Computer Chess Forums|Winboard Forum]], April 16, 2003
* [https://www.stmintz.com/ccc/index.php?id=317576 KTULU: A new strong WB-Engine (soon) - text german, sorry - ?] by [[Eduard Nemeth]], [[CCC]], September 24, 2003
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=45801 Ktulu 4.1 and 4.2] by [[Rahman Paidar]], [[Computer Chess Forums|Winboard Forum]], December 29, 2003
==2004==
* [https://www.stmintz.com/ccc/index.php?id=357995 Ktulu goes commercial] by Christian Koch, [[CCC]], April 02, 2004
* [https://www.stmintz.com/ccc/index.php?id=360209 Ktulu 5.0 by Rahman Paidar commercial available around April 22th, 2004!] by [[Frank Quisinsky]], [[CCC]], April 15, 2004
* [https://www.stmintz.com/ccc/index.php?id=362816 Ktulu 5.0 by Rahman Paidar (Iran) available in Gladiator-Shop tomorrow!] by [[Frank Quisinsky]], [[CCC]], May 01, 2004
* [https://www.stmintz.com/ccc/index.php?id=362930 Ktulu 5.0 and Patriot 1.2.2 released ...] by [[Frank Quisinsky]], [[CCC]], May 02, 2004
=External Links=
==Chess Engine==
* [https://www.lokasoft.nl/ktulu.aspx Ktulu 9] from [[Lokasoft]](as of July 2020, no longer available)
* [https://www.schachversand.de/software/schachprogramm/ktulu-8-upgrade.html Rahman Paidar - Ktulu 8] - [[Schachversand Niggemann]]
* [https://web.archive.org/web/20110611144445/http://www.playwitharena.com/?Newsticker:Archive_6 Ktulu 6.2 will be released soon], Interview with [[Rahman Paidar]] by [[Frank Quisinsky]], [[Arena|Arena News-Ticker]] 80, March 15, 2005 ([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine])
* [https://web.archive.org/web/20110611144744/http://www.playwitharena.com/?Newsticker:Archive_7 Ktulu 7.0 by Rahman Paidar], [[Arena|Arena News-Ticker]] 105-107, April 15, 2005 ([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine])
* [https://web.archive.org/web/20110611144520/http://www.playwitharena.com/?Newsticker:Archive_9 Ktulu's book learning by Rahman Paidar], [[Arena|Arena News-Ticker]] 133, May 10, 2005 ([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine])
* [https://www.schach-welt.de/schach/computerschach/news-ticker/archiv-seite-10 SWCR: Ktulu 9.03 Ergebnisse ...], [[Frank Quisinsky|Frank's Chess Page]], News-Ticker 096, March 24, 2010, hosted by [https://www.schach-welt.de/ Schachwelt] (German)
* [http://www.computerchess.org.uk/ccrl/4040/cgi/compare_engines.cgi?family=Ktulu&print=Rating+list&print=Results+table&print=LOS+table&print=Ponder+hit+table&print=Eval+difference+table&print=Comopp+gamenum+table&print=Overlap+table&print=Score+with+common+opponents Ktulu] in [[CCRL|CCRL 40/15]]
* [http://kirill-kryukov.com/chess/kcec/cgi/engine_details.cgi?print=Details&each_game=1&eng=Ktulu%204.2 Ktulu 4.2] in [[KCEC]]
