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a chess engine from the '''Chess Thinker''' collection of programs that include a [[Windows]] [[GUI|UI]] (Thinkerboard), a [[Pocket PC]] [https://en.wikipedia.org/wiki/Internet_Connection_Sharing ICS client] (Pocket PC Thinkerboard) and a [[Opening Book|Book]] engine (BookThinker) <ref>[https://www.game-ai-forum.org/icga-tournaments/program.php?id=612 Thinker's ICGA Tournaments]</ref> <ref>[http://www.oocities.org/thechessthinker/whatsnew.html Chess Thinker - What's New] (archived [https://en.wikipedia.org/wiki/GeoCities GeoCities] site)</ref>.
Thinker was initially developed by [[Lance Perkins]] as private engine with an own [[GUI]], who submitted the [[Chess Engine Communication Protocol]] compliant Thinker to [[Leo Dijksman|Leo Dijksman's]] [[WBEC|tournament]] <ref>[http://playwitharena.com/?Newsticker:Archive_8 Arena Chess GUI 3.0 - Archive 8 - Message 118 - Interview with the programmer of Thinker, Lance Perkins (Canada)] by [[Frank Quisinsky]], April 27, 2005</ref>. Since 2004, Thinker regularly participated at [[CCT Tournaments]], since 2008 at [[ACCA Americas' Computer Chess Championship]].
In 2009, the development of Thinker 5.x was assumed by [[Kerwin Medina]] <ref>[http://www.talkchess.com/forum3/viewtopic.php?topic_view=threads&t=27113&start=13 Re: Thinker output] by [[Lance Perkins]], [[CCC]], March 23, 2009</ref> <ref>[http://www.talkchess.com/forum/viewtopic.php?p=263263 Re: Best tactical engine?] by [[Lance Perkins]], [[CCC]], April 25, 2009</ref>, while Lance Perkins was/is still involved in development of the ''Chess Thinker'' collection, to port Thinker for Pocket PC and the [https://en.wikipedia.org/wiki/Nintendo_DS Nintendo DS].
In 2010, already under the aegis and lonesome authorship of Kerwin Medina, Thinker played the [[WCSC 2010]] and at the same time the [[WCCC 2010]] <ref>[https://www.game-ai-forum.org/icga-tournaments/program.php?id=612 Thinker's ICGA Tournaments]</ref>, where it became third, and was declared [[ICGA Investigations#2010|joint champion]] along with [[Rondo]] after the [[World Computer Chess Championship#RybkaDisqualification|disqualification]] of [[Rybka]] by the [[ICGA]] in June 2011. Further, Thinker won the [[ACCA 2010]] and the [[ACCA 2011]].
Thinker utilize [[Bitboards|bitboards]] and is written in [[Cpp|C++]]. Its class design disallows to output any infos while thinking during game play <ref>[http://www.talkchess.com/forum/viewtopic.php?topic_view=threads&p=257009&t=27113 Re: Thinker output] by [[Lance Perkins]], [[CCC]], March 22, 2009</ref>.
=Complaints=
[[ICGA]] President [[David Levy]], May 09, 2014 <ref>[https://icga.org/?p=919 Complaints against the Chess programs LOOP and THINKER] by [[David Levy]], [[ICGA]] President, May 9, 2014</ref>
The ICGA has received formal complaints against the Chess programs [[Loop(Program)|LOOP]] and THINKER, both of which have participated in the World Computer Chess Championship. LOOP was entered by Fritz Reul into the [[WCCC 2007|2007 WCCC]] in Amsterdam. THINKER was entered into the [[WCCC 2010|2010 WCCC]] in Kanazawa.
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Here we present extracts from the first section of each of [[Mark Watkins]] reports.
