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Created page with "'''Home * Engines * Strelka''' [[FILE:Strelka at essendon.jpg|border|right|thumb| Strelka [https://en.wikipedia.org/wiki/Sputnik_5 on tour] <ref>[https://en..."
'''[[Main Page|Home]] * [[Engines]] * Strelka'''
[[FILE:Strelka at essendon.jpg|border|right|thumb| Strelka [https://en.wikipedia.org/wiki/Sputnik_5 on tour] <ref>[https://en.wikipedia.org/wiki/Russian_space_dogs#Belka_and_Strelka Soviet space dogs from Wikipedia - Belka and Strelka]</ref> ]]
'''Strelka''' (Стрелка, Russian for "little arrow"),<br/>
a chess program by [[Jury Osipov]] which appeared as closed source engine in May 2007. Its successor, Strelka 2.0 was released as [[:Category:Open Source|open source program]] in January 2008. Strelka 2.x became runner up behind [[WildCat]] at the [[CCCCISC 2008|1st Computer Chess Championship of CIS Countries]] in 2008.
From the very beginning Strelka was suspected not to be original but [https://en.wikipedia.org/wiki/Derivative_work derivative work] as elaborated below. What kind of [https://en.wikipedia.org/wiki/Syllogism syllogism] from the claims and statements by [[Vasik Rajlich]], [[Fabien Letouzey]], Jury Osipov and others applies, remains to be seen. However, it is more likely the [https://en.wikipedia.org/wiki/Ethics ethical] issues of computer chess programming are affected rather than the [https://en.wikipedia.org/wiki/Legal legal] ones.
=Clone Suspicions=
Almost immediately after Strelka's initial release, there were suspicions due to various similarities found in solving certain [[Test-Positions|test-positions]] <ref>[http://www.talkchess.com/forum/viewtopic.php?p=116315 Re: My Tests with Strelka] by [[Eduard Nemeth]], [[CCC]], May 07, 2007</ref> <ref>[http://www.talkchess.com/forum/viewtopic.php?topic_view=threads&p=116341 Re: TO BE OR NOT TO BE] by [[Michael Scheidl|Mike Scheidl]], [[CCC]], May 07, 2007</ref>, that Strelka might be a clone of [[Rybka|Rybka 1.0 Beta]]. The attempt by [[Sergei Markoff]] after reviewing its sources to declare Strelka original, seemed rather pointless due to the closed sources of the now commercial [[Rybka]] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=13661 Sergei Markow about Strelka] by Werner Schüle, [[CCC]], May 09, 2007</ref>, but it was also confirmed by [[Bryan Hofmann]] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=13716 My review of Strelka Code] by [[Bryan Hofmann]], [[CCC]], May 12, 2007</ref><ref>[http://www.talkchess.com/forum/viewtopic.php?t=16836 Strelka 1.8 source code review] by [[Bryan Hofmann]], [[CCC]], October 01, 2007</ref>, who according to Markoff is a compiler expert who also did Rybka compiles and was aware of its sources <ref>[http://www.talkchess.com/forum/viewtopic.php?t=13676 To put everything into place with Strelka] by [[Sergei Markoff]], [[CCC]], May 10, 2007</ref> . Additionally, an "expert's opinion" was called from [[Dann Corbit]] to declare Strelka "clean" <ref>[http://www.talkchess.com/forum/viewtopic.php?topic_view=threads&p=117531&t=13716 Re: My review of Strelka Code] by [[Dann Corbit]], [[CCC]], May 12, 2007</ref><ref>[http://www.talkchess.com/forum/viewtopic.php?topic_view=threads&p=129446&t=14953 Re: Is strelka a clone?] by [[Dann Corbit]], [[CCC]], July 09, 2007</ref>. [[Fabien Letouzey]], who was consulted by Dann, put a short note that Strelka 1.x source was not a verbatim copy of his open source engine [[Fruit]], but revealed more details on that issue years later in January 2011, when he was long out of computer chess business and coincidentally got aware of the Strelka affair <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|Open Chess Forum]], January 23, 2011</ref> .
In the meantime, in July 2007, Jury Osipov admitted Strelka was based on [[Fruit]] rewritten to [[Bitboards|bitboards]], and was successively improved in [[Evaluation|evaluation]] and [[Search|search]] with correlation analysis of Rybka's assessment of the positions. Osipov further mentioned he studied Rybka using a [https://en.wikipedia.org/wiki/Disassembler disassembler], to achieve an even greater similarity, and that he felt that [[Vasik Rajlich]] likely walked the same path as he did, essentially to rewrite Fruit to bitboards and include [[Material Tables|material imbalance tables]] by [[Larry Kaufman]] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=15013 new translation of J.Osipov statement in KasparovChess forum] by Evgenii Manev, [[CCC]], July 12, 2007</ref>.
=Strelka 2.0=
In January 2008, the new Strelka version 2.0 released was open source, and everybody could compare Strelka 2.0 with the Fruit sources for the similarities or not, and whether the claims of Jury Osipov were correct. Notably, a few days later, [[Vasik Rajlich]] declared Strelka 2.0 a Rybka 1.0 Beta clone <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> , which on the other hand raised further suspicions on the origins of Rybka.
=Strelka 5=
In October 2011, Strelka 5 was released as closed source engine, according to Jury Osipov incorporating ideas of [[Rybka|Rybka 3]], [[Ippolit]], [[Houdini]], [[Critter]] and [[Stockfish]], as well as own innovations <ref>[http://strelkachess.narod.ru/Strelka5.html Народ.Ру: Осипов Юрий] (Russian)</ref> <ref>[http://www.talkchess.com/forum/viewtopic.php?t=40777 Strelka 5 by Yuriy Osipov] by Slavik Pavloff, [[CCC]], October 15, 2011</ref>.
=See also=
* [[Belka]]
* [[Claims that Strelka is Rybka]]
* [[Fruit]]
* [[Rybka]]
=Forum Posts=
==2007==
* [http://www.talkchess.com/forum/viewtopic.php?t=13573 New engine from Russia] by [[Vladimir Medvedev]], [[CCC]], May 05, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=13627 Something 'Fishy' about Strelka] by [[Dann Corbit]], [[CCC]], May 08, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=13661 Sergei Markow about Strelka] by Werner Schüle, [[CCC]], May 09, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=13676 To put everything into place with Strelka] by [[Sergei Markoff]], [[CCC]], May 10, 2007
: [http://www.talkchess.com/forum/viewtopic.php?t=13676&start=54 Re: To put everything into place with Strelka] by [[Alexander Schmidt]], [[CCC]], May 11, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=13702 Strelka again] by [[Sergei Markoff]], [[CCC]], May 11, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=13733 The Strelka affair to date] by [[Fernando Villegas]], [[CCC]], May 12, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=13716 My review of Strelka Code] by [[Bryan Hofmann]], [[CCC]], May 12, 2007
* [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
* [http://www.talkchess.com/forum/viewtopic.php?t=14921 Strelka 1.8 UCI released] by [[Denis Mendoza|Denis P. Mendoza]], [[CCC]], July 07, 2007
* [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
* [http://www.talkchess.com/forum/viewtopic.php?t=14988 Longer comments by V. Rajlich] by [[Marc Lacrosse]], [[CCC]], July 10, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=14995 More proof of Strelka cloning] by [[Martin Bryant]], [[CCC]], July 10, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=15009 Sensational! Y.Ossipov talking about STRELKA] by Evgenii Manev, [[CCC]], July 11, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=15017 Strelka and source code experts] by [[Matthias Gemuh]], [[CCC]], July 11, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=15013 new translation of J.Osipov statement in KasparovChess forum] by Evgenii Manev, [[CCC]], July 12, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=15076 Fruit, Rybka, Strelka final conclusion! (I hope)] by [[Michael Sherwin]], [[CCC]], July 13, 2007 » [[Rybka]], [[Strelka]]
* [http://www.talkchess.com/forum/viewtopic.php?t=16836 Strelka 1.8 source code review] by [[Bryan Hofmann]], [[CCC]], October 01, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=16879 Strelka - clone status] by [[Dann Corbit]], [[CCC]], October 03, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=18620 Strelka - Open source] by Evgenii Manev, [[CCC]], December 29, 2007
==2008==
* [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
* [http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=3006;pg=4 Re: Strelka 2.0 pg 4] by [[Anthony Cozzie]], [[Computer Chess Forums|Rybka Forum]], January 11, 2008
* [http://www.talkchess.com/forum/viewtopic.php?t=18864 What's Strelka's Secret Sauce?] by [[Steve Maughan]], [[CCC]], January 11, 2008
* [http://www.talkchess.com/forum/viewtopic.php?t=18885 A comment of Yuri Osipov about V.Rajlich statement] by Evgenii Manev, [[CCC]], January 12, 2008
* [http://www.talkchess.com/forum/viewtopic.php?t=18882 ethical dilemma] by [[Gerd Isenberg]], [[CCC]], January 12, 2008
* [http://www.talkchess.com/forum/viewtopic.php?t=19008 Rajlich/Osipov/Rybka/Strelka/Answers by Convekta] by [[Eduard Nemeth]], [[CCC]], January 17, 2008 » [[Rybka]], [[ChessOK|Convekta]]
* [http://www.talkchess.com/forum/viewtopic.php?t=19316 Toga/Glaurung/Strelka Prunings/Reductions] by [[Edsel Apostol]], [[CCC]], January 31, 2008 » [[Toga]], [[Glaurung]], [[Pruning]], [[Reductions]]
* [http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=3172 Anthony Cozzie speak !] by Silvian, [[Computer Chess Forums|Rybka Forum]], February 03, 2008 <ref>[http://www.stevelim.com/blog/?p=470 Anthony Cozzie speaks about Rybka source code] from [http://www.stevelim.com/ Steve Lim / SuperSteve3d - Home], February 04, 2008</ref>
* [http://www.talkchess.com/forum/viewtopic.php?t=20936 Strelka Reverse Engineered from Rybka: Details Examined] by Rick Fadden, [[CCC]], May 01, 2008
* [http://www.talkchess.com/forum/viewtopic.php?t=23095 Fruit 2.1 vs Strelka 2.0] by [[Norman Schmidt]], [[CCC]], August 18, 2008 » [[Fruit]]
* [http://www.talkchess.com/forum/viewtopic.php?t=23118 Rybka 1.0 vs. Strelka] by [[Zach Wegner]], [[CCC]], August 19, 2008
* [http://www.talkchess.com/forum/viewtopic.php?t=23172 counting similiarities between strelka2.0 and fruit2.1] by [[Uri Blass]], [[CCC]], August 22, 2008
* [http://www.talkchess.com/forum/viewtopic.php?t=24504 Strelka = Rybka 1.0 =Fruit 2.1 = Toga?? Oh how disappointing] by [[Oliver Brausch]], [[CCC]], October 21, 2008
==2011==
* [http://www.talkchess.com/forum/viewtopic.php?t=37762 Fabien's open letter to the community] by [[Tord Romstad]], [[CCC]], January 23, 2011
* [http://www.open-chess.org/viewtopic.php?f=3&t=1014 Fabien's open letter to the community] by [[Tord Romstad]], [[Computer Chess Forums|Open Chess Forum]], January 23, 2011
* [http://www.open-chess.org/viewtopic.php?f=3&t=1023 Revisiting Strelka/Rybka] by [[Mark Watkins]], [[Computer Chess Forums|Open Chess Forum]], January 25, 2011
* [http://www.talkchess.com/forum/viewtopic.php?topic_view=threads&p=390971&t=37773 Re: Strelka 2.0 B running for the IPON ...] by [[Jury Osipov]], [[Computer Chess Forums|CCC: Tournaments and Matches]], January 27, 2011
* [http://www.chessvibes.com/?q=reports/attack-of-the-clones Attack of the clones | ChessVibes] by [[David Levy]], 19 February, 2011
* [http://www.talkchess.com/forum/viewtopic.php?t=40777 Strelka 5 by Yuriy Osipov] by Slavik Pavloff, [[CCC]], October 15, 2011 » [[Houdini]]
* [http://talkchess.com/forum/viewtopic.php?topic_view=threads&p=436498&t=41272 Re: Komodo 4 on long time control] by [[Richard Vida]], [[CCC]], December 04, 2011 » [[Houdini]], [[Komodo]]
==2012 ...==
* [http://www.talkchess.com/forum/viewtopic.php?t=47144 strelka 5.6] by [[Don Dailey]], [[CCC]], February 06, 2013 (registration required)
* [http://www.talkchess.com/forum/viewtopic.php?t=49551 New Strelka 5.7 MP Available...] by [[Steve Maughan]], [[CCC]], October 02, 2013
* [http://www.talkchess.com/forum/viewtopic.php?t=52183 Strelka new edition] by [[Norbert Raimund Leisner]], [[CCC]], May 01, 2014
=External Links=
==Chess Engine==
* [https://en.wikipedia.org/wiki/Strelka_%28chess_engine%29 Strelka (chess engine) from Wikipedia]
* [https://en.wikipedia.org/wiki/Rybka#Strelka_controversy Strelka controversy from Wikipedia]
* [http://strelkachess.narod.ru/ Главная страница]
: [http://strelkachess.narod.ru/Strelka5.html Strelka5]
* [http://www.sdchess.ru/Strelka.htm Strelka Юрия Осипова, Россия] from [http://www.sdchess.ru/ sdchess.ru]
* [http://computerchess.org.uk/ccrl/4040/cgi/compare_engines.cgi?family=Strelka&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 Strelka] in [[CCRL|CCRL 40/40]]
==Misc==
* [https://en.wikipedia.org/wiki/Strelka Strelka disambiguation page from Wikipedia]
* [https://en.wikipedia.org/wiki/Sputnik_5 Korabl-Sputnik 2 with Belka and Strelka from Wikipedia]
=References=
<references />
'''[[Engines|Up one Level]]'''
[[Category:Mammal]]
[[FILE:Strelka at essendon.jpg|border|right|thumb| Strelka [https://en.wikipedia.org/wiki/Sputnik_5 on tour] <ref>[https://en.wikipedia.org/wiki/Russian_space_dogs#Belka_and_Strelka Soviet space dogs from Wikipedia - Belka and Strelka]</ref> ]]
'''Strelka''' (Стрелка, Russian for "little arrow"),<br/>
a chess program by [[Jury Osipov]] which appeared as closed source engine in May 2007. Its successor, Strelka 2.0 was released as [[:Category:Open Source|open source program]] in January 2008. Strelka 2.x became runner up behind [[WildCat]] at the [[CCCCISC 2008|1st Computer Chess Championship of CIS Countries]] in 2008.
From the very beginning Strelka was suspected not to be original but [https://en.wikipedia.org/wiki/Derivative_work derivative work] as elaborated below. What kind of [https://en.wikipedia.org/wiki/Syllogism syllogism] from the claims and statements by [[Vasik Rajlich]], [[Fabien Letouzey]], Jury Osipov and others applies, remains to be seen. However, it is more likely the [https://en.wikipedia.org/wiki/Ethics ethical] issues of computer chess programming are affected rather than the [https://en.wikipedia.org/wiki/Legal legal] ones.
=Clone Suspicions=
Almost immediately after Strelka's initial release, there were suspicions due to various similarities found in solving certain [[Test-Positions|test-positions]] <ref>[http://www.talkchess.com/forum/viewtopic.php?p=116315 Re: My Tests with Strelka] by [[Eduard Nemeth]], [[CCC]], May 07, 2007</ref> <ref>[http://www.talkchess.com/forum/viewtopic.php?topic_view=threads&p=116341 Re: TO BE OR NOT TO BE] by [[Michael Scheidl|Mike Scheidl]], [[CCC]], May 07, 2007</ref>, that Strelka might be a clone of [[Rybka|Rybka 1.0 Beta]]. The attempt by [[Sergei Markoff]] after reviewing its sources to declare Strelka original, seemed rather pointless due to the closed sources of the now commercial [[Rybka]] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=13661 Sergei Markow about Strelka] by Werner Schüle, [[CCC]], May 09, 2007</ref>, but it was also confirmed by [[Bryan Hofmann]] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=13716 My review of Strelka Code] by [[Bryan Hofmann]], [[CCC]], May 12, 2007</ref><ref>[http://www.talkchess.com/forum/viewtopic.php?t=16836 Strelka 1.8 source code review] by [[Bryan Hofmann]], [[CCC]], October 01, 2007</ref>, who according to Markoff is a compiler expert who also did Rybka compiles and was aware of its sources <ref>[http://www.talkchess.com/forum/viewtopic.php?t=13676 To put everything into place with Strelka] by [[Sergei Markoff]], [[CCC]], May 10, 2007</ref> . Additionally, an "expert's opinion" was called from [[Dann Corbit]] to declare Strelka "clean" <ref>[http://www.talkchess.com/forum/viewtopic.php?topic_view=threads&p=117531&t=13716 Re: My review of Strelka Code] by [[Dann Corbit]], [[CCC]], May 12, 2007</ref><ref>[http://www.talkchess.com/forum/viewtopic.php?topic_view=threads&p=129446&t=14953 Re: Is strelka a clone?] by [[Dann Corbit]], [[CCC]], July 09, 2007</ref>. [[Fabien Letouzey]], who was consulted by Dann, put a short note that Strelka 1.x source was not a verbatim copy of his open source engine [[Fruit]], but revealed more details on that issue years later in January 2011, when he was long out of computer chess business and coincidentally got aware of the Strelka affair <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|Open Chess Forum]], January 23, 2011</ref> .
In the meantime, in July 2007, Jury Osipov admitted Strelka was based on [[Fruit]] rewritten to [[Bitboards|bitboards]], and was successively improved in [[Evaluation|evaluation]] and [[Search|search]] with correlation analysis of Rybka's assessment of the positions. Osipov further mentioned he studied Rybka using a [https://en.wikipedia.org/wiki/Disassembler disassembler], to achieve an even greater similarity, and that he felt that [[Vasik Rajlich]] likely walked the same path as he did, essentially to rewrite Fruit to bitboards and include [[Material Tables|material imbalance tables]] by [[Larry Kaufman]] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=15013 new translation of J.Osipov statement in KasparovChess forum] by Evgenii Manev, [[CCC]], July 12, 2007</ref>.
=Strelka 2.0=
In January 2008, the new Strelka version 2.0 released was open source, and everybody could compare Strelka 2.0 with the Fruit sources for the similarities or not, and whether the claims of Jury Osipov were correct. Notably, a few days later, [[Vasik Rajlich]] declared Strelka 2.0 a Rybka 1.0 Beta clone <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> , which on the other hand raised further suspicions on the origins of Rybka.
=Strelka 5=
In October 2011, Strelka 5 was released as closed source engine, according to Jury Osipov incorporating ideas of [[Rybka|Rybka 3]], [[Ippolit]], [[Houdini]], [[Critter]] and [[Stockfish]], as well as own innovations <ref>[http://strelkachess.narod.ru/Strelka5.html Народ.Ру: Осипов Юрий] (Russian)</ref> <ref>[http://www.talkchess.com/forum/viewtopic.php?t=40777 Strelka 5 by Yuriy Osipov] by Slavik Pavloff, [[CCC]], October 15, 2011</ref>.
=See also=
* [[Belka]]
* [[Claims that Strelka is Rybka]]
* [[Fruit]]
* [[Rybka]]
=Forum Posts=
==2007==
* [http://www.talkchess.com/forum/viewtopic.php?t=13573 New engine from Russia] by [[Vladimir Medvedev]], [[CCC]], May 05, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=13627 Something 'Fishy' about Strelka] by [[Dann Corbit]], [[CCC]], May 08, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=13661 Sergei Markow about Strelka] by Werner Schüle, [[CCC]], May 09, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=13676 To put everything into place with Strelka] by [[Sergei Markoff]], [[CCC]], May 10, 2007
: [http://www.talkchess.com/forum/viewtopic.php?t=13676&start=54 Re: To put everything into place with Strelka] by [[Alexander Schmidt]], [[CCC]], May 11, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=13702 Strelka again] by [[Sergei Markoff]], [[CCC]], May 11, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=13733 The Strelka affair to date] by [[Fernando Villegas]], [[CCC]], May 12, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=13716 My review of Strelka Code] by [[Bryan Hofmann]], [[CCC]], May 12, 2007
* [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
* [http://www.talkchess.com/forum/viewtopic.php?t=14921 Strelka 1.8 UCI released] by [[Denis Mendoza|Denis P. Mendoza]], [[CCC]], July 07, 2007
* [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
* [http://www.talkchess.com/forum/viewtopic.php?t=14988 Longer comments by V. Rajlich] by [[Marc Lacrosse]], [[CCC]], July 10, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=14995 More proof of Strelka cloning] by [[Martin Bryant]], [[CCC]], July 10, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=15009 Sensational! Y.Ossipov talking about STRELKA] by Evgenii Manev, [[CCC]], July 11, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=15017 Strelka and source code experts] by [[Matthias Gemuh]], [[CCC]], July 11, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=15013 new translation of J.Osipov statement in KasparovChess forum] by Evgenii Manev, [[CCC]], July 12, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=15076 Fruit, Rybka, Strelka final conclusion! (I hope)] by [[Michael Sherwin]], [[CCC]], July 13, 2007 » [[Rybka]], [[Strelka]]
* [http://www.talkchess.com/forum/viewtopic.php?t=16836 Strelka 1.8 source code review] by [[Bryan Hofmann]], [[CCC]], October 01, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=16879 Strelka - clone status] by [[Dann Corbit]], [[CCC]], October 03, 2007
* [http://www.talkchess.com/forum/viewtopic.php?t=18620 Strelka - Open source] by Evgenii Manev, [[CCC]], December 29, 2007
==2008==
* [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
* [http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=3006;pg=4 Re: Strelka 2.0 pg 4] by [[Anthony Cozzie]], [[Computer Chess Forums|Rybka Forum]], January 11, 2008
* [http://www.talkchess.com/forum/viewtopic.php?t=18864 What's Strelka's Secret Sauce?] by [[Steve Maughan]], [[CCC]], January 11, 2008
* [http://www.talkchess.com/forum/viewtopic.php?t=18885 A comment of Yuri Osipov about V.Rajlich statement] by Evgenii Manev, [[CCC]], January 12, 2008
* [http://www.talkchess.com/forum/viewtopic.php?t=18882 ethical dilemma] by [[Gerd Isenberg]], [[CCC]], January 12, 2008
* [http://www.talkchess.com/forum/viewtopic.php?t=19008 Rajlich/Osipov/Rybka/Strelka/Answers by Convekta] by [[Eduard Nemeth]], [[CCC]], January 17, 2008 » [[Rybka]], [[ChessOK|Convekta]]
* [http://www.talkchess.com/forum/viewtopic.php?t=19316 Toga/Glaurung/Strelka Prunings/Reductions] by [[Edsel Apostol]], [[CCC]], January 31, 2008 » [[Toga]], [[Glaurung]], [[Pruning]], [[Reductions]]
* [http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=3172 Anthony Cozzie speak !] by Silvian, [[Computer Chess Forums|Rybka Forum]], February 03, 2008 <ref>[http://www.stevelim.com/blog/?p=470 Anthony Cozzie speaks about Rybka source code] from [http://www.stevelim.com/ Steve Lim / SuperSteve3d - Home], February 04, 2008</ref>
* [http://www.talkchess.com/forum/viewtopic.php?t=20936 Strelka Reverse Engineered from Rybka: Details Examined] by Rick Fadden, [[CCC]], May 01, 2008
* [http://www.talkchess.com/forum/viewtopic.php?t=23095 Fruit 2.1 vs Strelka 2.0] by [[Norman Schmidt]], [[CCC]], August 18, 2008 » [[Fruit]]
* [http://www.talkchess.com/forum/viewtopic.php?t=23118 Rybka 1.0 vs. Strelka] by [[Zach Wegner]], [[CCC]], August 19, 2008
* [http://www.talkchess.com/forum/viewtopic.php?t=23172 counting similiarities between strelka2.0 and fruit2.1] by [[Uri Blass]], [[CCC]], August 22, 2008
* [http://www.talkchess.com/forum/viewtopic.php?t=24504 Strelka = Rybka 1.0 =Fruit 2.1 = Toga?? Oh how disappointing] by [[Oliver Brausch]], [[CCC]], October 21, 2008
==2011==
* [http://www.talkchess.com/forum/viewtopic.php?t=37762 Fabien's open letter to the community] by [[Tord Romstad]], [[CCC]], January 23, 2011
* [http://www.open-chess.org/viewtopic.php?f=3&t=1014 Fabien's open letter to the community] by [[Tord Romstad]], [[Computer Chess Forums|Open Chess Forum]], January 23, 2011
* [http://www.open-chess.org/viewtopic.php?f=3&t=1023 Revisiting Strelka/Rybka] by [[Mark Watkins]], [[Computer Chess Forums|Open Chess Forum]], January 25, 2011
* [http://www.talkchess.com/forum/viewtopic.php?topic_view=threads&p=390971&t=37773 Re: Strelka 2.0 B running for the IPON ...] by [[Jury Osipov]], [[Computer Chess Forums|CCC: Tournaments and Matches]], January 27, 2011
* [http://www.chessvibes.com/?q=reports/attack-of-the-clones Attack of the clones | ChessVibes] by [[David Levy]], 19 February, 2011
* [http://www.talkchess.com/forum/viewtopic.php?t=40777 Strelka 5 by Yuriy Osipov] by Slavik Pavloff, [[CCC]], October 15, 2011 » [[Houdini]]
* [http://talkchess.com/forum/viewtopic.php?topic_view=threads&p=436498&t=41272 Re: Komodo 4 on long time control] by [[Richard Vida]], [[CCC]], December 04, 2011 » [[Houdini]], [[Komodo]]
==2012 ...==
* [http://www.talkchess.com/forum/viewtopic.php?t=47144 strelka 5.6] by [[Don Dailey]], [[CCC]], February 06, 2013 (registration required)
* [http://www.talkchess.com/forum/viewtopic.php?t=49551 New Strelka 5.7 MP Available...] by [[Steve Maughan]], [[CCC]], October 02, 2013
* [http://www.talkchess.com/forum/viewtopic.php?t=52183 Strelka new edition] by [[Norbert Raimund Leisner]], [[CCC]], May 01, 2014
=External Links=
==Chess Engine==
* [https://en.wikipedia.org/wiki/Strelka_%28chess_engine%29 Strelka (chess engine) from Wikipedia]
* [https://en.wikipedia.org/wiki/Rybka#Strelka_controversy Strelka controversy from Wikipedia]
* [http://strelkachess.narod.ru/ Главная страница]
: [http://strelkachess.narod.ru/Strelka5.html Strelka5]
* [http://www.sdchess.ru/Strelka.htm Strelka Юрия Осипова, Россия] from [http://www.sdchess.ru/ sdchess.ru]
* [http://computerchess.org.uk/ccrl/4040/cgi/compare_engines.cgi?family=Strelka&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 Strelka] in [[CCRL|CCRL 40/40]]
==Misc==
* [https://en.wikipedia.org/wiki/Strelka Strelka disambiguation page from Wikipedia]
* [https://en.wikipedia.org/wiki/Sputnik_5 Korabl-Sputnik 2 with Belka and Strelka from Wikipedia]
=References=
<references />
'''[[Engines|Up one Level]]'''
[[Category:Mammal]]
