Changes

Vasik Rajlich's interpretation of [[Node|nodes]] and [[Depth|depth]] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=23037 To Jeroen and interested minds, re. Tiger node count] by [[Christophe Théron]], [[CCC]], August 15, 2008</ref> and the [[Strelka]] controversy <ref>[https://en.wikipedia.org/wiki/Rybka#Strelka_controversy Strelka controversy from Wikipedia]</ref> <ref>[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=3006 Strelka 2.0] by Vasik Rajlich, January 11, 2008</ref> <ref>[http://www.talkchess.com/forum/viewtopic.php?t=37762 Fabien's open letter to the community] by [[Tord Romstad]], [[CCC]], January 23, 2011</ref> <ref>[http://www.open-chess.org/viewtopic.php?f=3&t=1014 Fabien's open letter to the community] by [[Tord Romstad]], [[Computer Chess Forums|OpenChess Forum]], January 23, 2011</ref> raised suspicions about the initial origin of Rybka 1.0 <ref>[http://www.talkchess.com/forum/viewtopic.php?t=23118 Rybka 1.0 vs. Strelka] by [[Zach Wegner]], [[CCC]], August 19, 2008</ref> <ref>[http://www.talkchess.com/forum/viewtopic.php?t=23249 Questions for Vas] by [[Zach Wegner]], [[CCC]], August 25, 2008</ref>, but Vasik Rajlich categorically denied Rybka 1.0 was based on [[Fruit]] <ref>[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?pid=19118#pid19118 Is Rybka a derivative of Fruit?], [[Computer Chess Forums|Rybka Forum]], July 14, 2007</ref> <ref>[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=6772 question to vas on similarity of rybka 1.0 to fruit], [[Computer Chess Forums|Rybka Forum]], August 25, 2008</ref>, as already mentioned initially confirmed by [[Chrilly Donninger]] in 2005 <ref>[https://www.stmintz.com/ccc/index.php?id=469209 Rybka uses PVS and not MTD(f). Its no Fruit-Clone] by [[Chrilly Donninger]], [[CCC]], December 12, 2005</ref> after early rumours <ref>[https://www.stmintz.com/ccc/index.php?id=467208 Is Rybka a fruit clone?] by Ziad Haddad, [[CCC]], December 06, 2005</ref> and questions <ref>[https://www.stmintz.com/ccc/index.php?id=469130 Rybka - How much Fruit is inside?] by [[Daniel Mehrmann]], [[CCC]], December 11, 2005</ref> arose, but despite confusing Fruit using [[MTD(f)]], Donninger claimed Rybka was basically Fruit in 2007 <ref>[https://www.hiarcs.net/forums/viewtopic.php?t=398&start=19 Re: I know something of Dr.Donninger] by [[Harvey Williamson]], [[Computer Chess Forums|Hiarcs Forum]], October 16, 2007, quoted with the kind permission of [[Chrilly Donninger|Chrilly]] and [[Enrique Irazoqui|Enir]]</ref>. On January 19, 2011 [[ICGA]] president [[David Levy]] broached on [[:Category:Clone|cloning]] issues in a ''ChessVibes'' column, covering the controversies, where Vasik again confirmed Rybka source is original after he was invited to comment on [[Zach Wegner|Zach Wegner’s]] analysis <ref>Rybka/Fruit: evaluation by [[Zach Wegner]], 2010</ref> a few days before Levy wrote his article <ref>Attack of the clones | ChessVibes by [[David Levy]], 19 February, 2011</ref>. In June 2011, the [[ICGA]] has [[World Computer Chess Championship#RybkaDisqualification|disqualified]] and banned [[Rybka]] and its programmer Vasik Rajlich from previous and future World Computer Chess Championships.

Quotes from an ''uciengines.de'' Interview with Vasik Rajlich, December 20, 2005 <ref>[http://web.archive.org/web/20160316125302/http://www.top-5000.nl/int/rybka.htm Interview with Vasik Rajlich] by [[Christopher Conkie]], [[Michael Diosi]], [[Frank Quisinsky]] & [[Alexander Schmidt]], December 20, 2005, hosted by [[Ed Schroder|Ed Schröder]]([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine])</ref>, ''a new age in Computerchess?'' Two questions by [[Alexander Schmidt]]:

We had our first contact when I had questions about a [[Engine Similarity|similarity ]] to Fruit in the search, others found similarities in the evaluation. Some people where a little bit suspicious that Rybka could be a clone of the open source engine. In the meantime it is clear that Rybka is no clone but you used ideas of Fruit (I guess all other serious engine programmers had a look at Fruit too). How strong would Rybka actually be if the Fruit code would have never been published?

* [http://web.archive.org/web/20160316125302/http://www.top-5000.nl/int/rybka.htm Interview with Vasik Rajlich] by [[Christopher Conkie]], [[Michael Diosi]], [[Frank Quisinsky]] & [[Alexander Schmidt]], December 20, 2005, hosted by [[Ed Schroder|Ed Schröder]]([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine])