Changes

Vasik Rajlich started developing Rybka in about 2003, and worked full-time on it since 2005. The appearance of the free ''Rybka 1 beta'' <ref>[https://www.stmintz.com/ccc/index.php?id=465686 Rybka 1.0 beta release - need testers] by [[Vasik Rajlich]], [[CCC]], November 30, 2005</ref> <ref>[http://www.chess.com/download/view/rybka-beta-10 Rybka Beta 1.0 - Chess.com]</ref> and the first commercial version, ''Rybka 1'' <ref>[https://www.stmintz.com/ccc/index.php?id=466792 Rybka 1.0 Announcement] by [[Vasik Rajlich]], [[CCC]], December 05, 2005</ref> end of 2005 was a sensation, and Rybka soon became the dominating program leading [[Engine Rating Lists|rating lists]] by a huge margin <ref>[http://www.talkchess.com/forum/viewtopic.php?t=13289 SSDF Rating List 2007-04-21] by [[Thoralf Karlsson]], [[CCC]], April 21, 2007</ref> <ref>[http://www.husvankempen.de/nunn/40_120_ratinglist/Quad/qratinglist.html CEGT Quad Versions 40/120 (AMD 3500+/4200+)]</ref> . ''Rybka 3'' was developed in collaboration with [[Larry Kaufman]], the most recent and strongest version ''Rybka 4'' and the parallel version ''Deep Rybka 4'' appeared in April 2010, market as standalone chess engine from RybkaChess.com <ref>[http://www.rybkachess.com/index.php?auswahl=Purchase+Rybka Rybka - for the serious chess player - Purchase Rybka]</ref> , from [[ChessOK]] optional with the [[Aquarium]] [[GUI]] <ref>[http://chessok.com/shop/index.php?main_page=index&cPath=7_1 Rybka & Aquarium - ChessOK shop]</ref> , or from [[ChessBase]] packaged with the [[Fritz]] [[GUI]] <ref>[http://www.chessbase.com/shop/product.asp?pid=506 Chess software - Rybka 4] from [[ChessBase]]</ref> . The demo version ''Rybka 2.3.2a'' can be downloaded for free <ref>[http://www.rybkachess.com/index.php?auswahl=Demo+version Rybka - for the serious chess player - Download Rybka 2.3.2a]</ref> .

Rajlich's interpretation of [[Nodes per Second|nodes]] and [[Depth|depth]] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=14959 What Strelka tells about Rybka's nodecount and depth] by [[Ernest Bonnem]], [[CCC]], July 09, 2007</ref> <ref>[http://www.johnljerz.com/superduper/tlxdownloadsiteMAIN/id18.html Does Rybka Properly Count Positions Evaluated?] by [[John L. Jerz]]</ref> <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> <ref>[http://www.talkchess.com/forum/viewtopic.php?topic_view=threads&p=328195&t=32335 Re: Question to Larry Kaufman about Rybka] by [[Larry Kaufman]], [[CCC]], February 05, 2010</ref> <ref>[http://www.open-chess.org/viewtopic.php?f=5&t=1004 Node counting] by [[Mark Watkins|BB+]], [[Computer Chess Forums|OpenChess Forum]], January 20, 2011</ref> , and the [https://en.wikipedia.org/wiki/Rybka#Strelka_controversy controversy] about [[Strelka]] <ref>[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=1655 Strelka = Rybka 1.0] by DarkAvenger, [[Computer Chess Forums|Rybka Forum]], July 07, 2007</ref> <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> 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 Re: Is Rybka a derivative of Fruit?] by [[Vasik Rajlich]], [[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] by duncan, [[Computer Chess Forums|Rybka Forum]], August 25, 2008</ref> , as 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 rumors <ref>[https://www.stmintz.com/ccc/index.php?id=467208 Is Rybbka 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>.

* [https://www.stmintz.com/ccc/index.php?id=487223 Rybka's NPS - one presumption] by [[Vladan Vučković]], [[CCC]], February 16, 2006 » [[Nodes per secondSecond]]