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'''[[Main Page|Home]] * [[Engines]] * Deep Thought'''
[[FILE:deep-thought-i-board.102645419.hsu.jpg|border|right|thumb|link=http://www.computerhistory.org/chess/art-431f4cc1815a3/|Deep Thought I - circuit board <ref>[http://www.computerhistory.org/chess/art-431f4cc1815a3/ Deep Thought I circuit board ca. 1988] Photo by [[Feng-hsiung Hsu]] hosted by [[The Computer History Museum]]</ref> ]]
'''Deep Thought''',<br/>
was a computer chess machine built at [[Carnegie Mellon University]] in the 1980's, the predecessor to [[Deep Blue]]. The project was initially started 1985 as [[Chiptest]] by the computer science doctoral students [[Feng-hsiung Hsu]] and [[Thomas Anantharaman]]. [[Murray Campbell]], former co-developer of [[HiTech]], joined the ChipTest team a few month later - followed by [[Andreas Nowatzyk]], [[Mike Browne]] and [[Peter Jansen]]. The program was named Deep Thought after the fictional computer of the same name <ref>[https://en.wikipedia.org/wiki/The_Hitchhiker%27s_Guide_to_the_Galaxy The Hitchhiker's Guide to the Galaxy from Wikipeadia]</ref> .
=Photos=
[[FILE:deep-thought-team-1988.102645336.hsu.jpg|none|border|text-bottom|640px|link=http://www.computerhistory.org/chess/stl-430b9bbd52f71/]]
[[Murray Campbell]], [[Feng-hsiung Hsu]], [[Thomas Anantharaman]], [[Mike Browne]] and [[Andreas Nowatzyk]],<br/>
after winning the [[Edward Fredkin#Prize|Fredkin Intermediate Prize]] for Deep Thought's Grandmaster-level performance. <ref>[http://www.computerhistory.org/chess/stl-430b9bbd52f71/ Deep Thought team with Fredkin Intermediate Prize] 1988, Gift of [[Feng-hsiung Hsu]] hosted by [[The Computer History Museum]]</ref>
=Achievements=
* In [[Timeline#1988|1988]] Deep Thought and Grandmaster [https://en.wikipedia.org/wiki/Tony_Miles Tony Miles] shared first place in the Software Toolworks Open in Los Angeles. Deep Thought had a 2745 performance rating, and moved its [https://en.wikipedia.org/wiki/United_States_Chess_Federation U.S. Chess Federation] (USCF) rating up to 2551, and qualified for the $10,000 [[Edward Fredkin#Prize|Fredkin Intermediate Prize]] as the first computer to achieve a USCF performance rating of 2500 over a set of 25 contiguous games in human tournaments <ref>[[Hans Berliner]] ('''1989'''). ''Deep Thought Wins Fredkin Intermediate Prize''. AI Magazine Volume 10 Number 2, [http://www.aaai.org/ojs/index.php/aimagazine/article/viewFile/753/671 pdf]</ref>
* In 1988 Deep Thought won the [[ACM 1988|ACM championship in Orlando]]
* In [[Timeline#1989|1989]] Deep Thought won the [[WCCC 1989|6th World Computer Chess Championship in Edmonton]], with a perfect 5-0 score
* In 1989 [[Garry Kasparov]] defeated Deep Thought in a [[Kasparov versus Deep Thought 1989|match by winning 2 games]]
* In 1989 Deep Thought won the [[ACM 1989|ACM championship in Reno]] (tied with [[HiTech]] <ref>[http://groups.google.com/group/rec.games.chess/browse_frm/thread/457406aed770f6be Aegon Tournament 1990; Hitech best overall] by [[Hans Berliner]], [[Computer Chess Forums|rec.games.chess]], May 25, 1990</ref>)
* In 1989 Deep Thought beat International Master [[David Levy]] in a [[Levy versus Deep Thought 1989|match with 4 wins]]
* In 1989 [[IBM]] started working on [[Deep Blue]]
* In [[Timeline#1990|1990]] Deep Thought won the [[ACM 1990|ACM championship in New York City]]
* In [[Timeline#1991|1991]] Deep Thought II won the [[ACM 1991|ACM championship in Albuquerque]]
=Hardware=
[[FILE:DeepThoughtMG.JPG|none|border|text-bottom|640px|link=Kasparov versus Deep Thought 1989#Video]]
[https://en.wikipedia.org/wiki/Photomask Photomask] of the [[ChipTest#MoveGeneration|move generation chip]], a [[Combinatorial Logic|combinational logic]] 8x8 [[Array|array]] <ref>from [[Kasparov versus Deep Thought 1989#Video|Kasparov versus Deep Thought 1989 documentary]], Video 2, 10:49</ref>
=Software=
[[FILE:DeepThoughtHash.JPG|none|border|text-bottom|640px|link=Kasparov versus Deep Thought 1989#Video]]
View into Deep Thought's source written in [[C]] with [[C#Goto|gotos]] <ref>from [[Kasparov versus Deep Thought 1989#Video|Kasparov versus Deep Thought 1989 documentary]], Video 2, 13:35</ref>
=See also=
* [[Chiptest]]
* [[Deep Blue]]
* [[Eval Tuning in Deep Thought]]
* [[Various Classifications#Fiction|Fiction]]
* [[Kasparov versus Deep Thought 1989]]
* [[Levy versus Deep Thought 1989]]
* [[Various Classifications#Thought|Thought]]
=Publications=
* [[Thomas Anantharaman]], [[Murray Campbell]], [[Feng-hsiung Hsu]] ('''1988'''). ''Singular extensions: Adding Selectivity to Brute-Force Searching''. AAAI Spring Symposium, Computer Game Playing, pp. 8-13. Also published in [[ICGA Journal#11_4|ICCA Journal, Vol. 11, No. 4]], republished (1990) in [https://en.wikipedia.org/wiki/Artificial_Intelligence_%28journal%29 Artificial Intelligence], Vol. 43, No. 1, pp. 99-109. ISSN 0004-3702.
* [[Hans Berliner]] ('''1989'''). ''Deep Thought Wins Fredkin Intermediate Prize''. AI Magazine Volume 10 Number 2, [http://www.aaai.org/ojs/index.php/aimagazine/article/viewFile/753/671 pdf]
* [[David Levy]] ('''1990'''). ''The End of an Era''. [[ICGA Journal#13_1|ICCA Journal, Vol. 13, No. 1]] » [[Levy versus Deep Thought 1989]]
* [[Michael Valvo]] ('''1990'''). ''Moral Victory: Karpov versus Deep Thought at Harvard''. [[ICGA Journal#13_1|ICCA Journal, Vol. 13, No. 1]] <ref>[http://www.skepticfiles.org/cowtext/comput~1/karpovpr.htm Karpov vs. DEEP THOUGHT Cambridge, Massachusetts reported by Darren Bedwell, Compuserve 73]</ref>
* [[Feng-hsiung Hsu]], [[Thomas Anantharaman]], [[Murray Campbell]], [[Andreas Nowatzyk]] ('''1990'''). ''Deep Thought''. [[Computers, Chess, and Cognition]], pp. 55-78
* [[Feng-hsiung Hsu]], [[Thomas Anantharaman]], [[Murray Campbell]], [[Andreas Nowatzyk]] ('''1990'''). ''[http://www.disi.unige.it/person/DelzannoG/AI2/hsu.html A Grandmaster Chess Machine]''. [[Scientific American]], Vol. 263, No. 4, pp. 44-50. ISSN 0036-8733.
* [[Frederic Friedel]] ('''1991'''). ''Not the Mother of all Chess Machines''. [[ICGA Journal#14_2|ICCA Journal, Vol. 14, No. 2]] <ref>[https://en.wikipedia.org/wiki/CeBIT CeBIT], [http://www.365chess.com/tournaments/Hannover_1991/18664 Hannover 1991 - 365Chess.com Tournaments]</ref>
* [[Robert Levinson]] ('''1991'''). ''Man and machine, theory and practice square off in Sydney''. [[ICGA Journal#14_3|ICCA Journal, Vol. 14, No. 3]] <ref>[[Conferences#IJCAI1991|12. IJCAI 1991]] and [[Deep Thought]] vs. [https://en.wikipedia.org/wiki/Darryl_Johansen Darryl Johansen] 1-1, [https://en.wikipedia.org/wiki/Sydney Sydney], August 28, 1991</ref> <ref>[http://www.chessgames.com/perl/chess.pl?pid=13728&pid2=47022 Deep Thought vs. Darryl K. Johansen] from [http://www.chessgames.com/index.html chessgames.co]</ref>
* [[Paul Hsieh]] ('''1996'''). ''[[Deep Blue]] - Deep Thought 2''. [[Computer Chess Reports]], Vol 5, No 3+4, pp. 45
=Forum Posts=
==1989==
* [https://groups.google.com/d/msg/rec.games.chess/vzpOWhHfk8c/ThAS2pQQ_rMJ Valvo-DT Match: Move 46] by [[Michael Valvo|Mike Valvo]], [[Computer Chess Forums|rec.games.chess]], March 30, 1989
* [https://groups.google.com/d/msg/rec.games.chess/2Dm3Ps87ALE/6qvBtkRMEuUJ Challange Match] by [[Michael Valvo|Mike Valvo]], [[Computer Chess Forums|rec.games.chess]], March 31, 1989
* [https://groups.google.com/d/msg/rec.games.chess/VMKpRaD9dSc/CLgzuim7pUYJ Valvo-DT Match: Move 48] by [[Michael Valvo|Mike Valvo]], [[Computer Chess Forums|rec.games.chess]], April 01, 1989
* [http://groups.google.com/group/rec.games.chess/browse_frm/thread/3d30a29100dc3fd2/afdb2d7f712f1be2 World Computer Chess Championship (the human side)] by [[Feng-hsiung Hsu]], [[Computer Chess Forums|rec.games.chess]], June 04, 1989 » [[WCCC 1989]]
* [https://groups.google.com/d/msg/rec.games.chess/6Dm8HdxUFM8/hBlVnQkxqBcJ DT - Kasparov : 0-2] by [[Peter Jansen]], [[Computer Chess Forums|rec.games.chess]], October 23, 1989 » [[Kasparov versus Deep Thought 1989]]
* [https://groups.google.com/d/msg/rec.games.chess/P-_Glk_Eta0/zQiLzkpRrq0J Levy - DT match (1)] by [[Peter Jansen]], [[Computer Chess Forums|rec.games.chess]], December 22, 1989 » [[Levy versus Deep Thought 1989]]
* [https://groups.google.com/d/msg/rec.games.chess/9rI-3sgNfXc/eXmmXvTOjOIJ Levy - DT match (2)] by [[Peter Jansen]], [[Computer Chess Forums|rec.games.chess]], December 22, 1989
* [https://groups.google.com/d/msg/rec.games.chess/9wMJRB2iHLw/56JB8LPXFRUJ Levy - DT match (3)] by [[Peter Jansen]], [[Computer Chess Forums|rec.games.chess]], December 23, 1989
* [https://groups.google.com/d/msg/rec.games.chess/ZOBAvN0-29c/HMQiuEePe7MJ Levy - DT match (4)] by [[Peter Jansen]], [[Computer Chess Forums|rec.games.chess]], December 23, 1989
==1990 ...==
* [http://groups.google.com/group/rec.games.chess/browse_frm/thread/763e61b8dd3cb7d9/723ff23220e73f73 Karpov-DT Match, Face to Screen] by [[Feng-hsiung Hsu]], [[Computer Chess Forums|rec.games.chess]], February 04, 1990
* [http://groups.google.com/group/rec.games.chess/browse_frm/thread/195d7f43cbe85c98 Deep Thought] by Thorsten Heedt, [[Computer Chess Forums|rec.games.chess]], April 11, 1995
==2000 ...==
* [https://www.stmintz.com/ccc/index.php?id=128297 Deep Thought's tuning code and eval function!] by [[Severi Salminen]], [[CCC]], September 05, 2000 » [[Eval Tuning in Deep Thought]]
* [https://www.stmintz.com/ccc/index.php?id=386936 Test Position = GM Tony Miles vs Deep Thought, 1989 [14...Bxh2!!]] by [[José Antônio Fabiano Mendes]], [[CCC]], September 09, 2004
=External Links=
* [https://en.wikipedia.org/wiki/Deep_Thought_%28chess_computer%29 Deep Thought from Wikipedia]
* [https://www.game-ai-forum.org/icga-tournaments/program.php?id=349 Deep Thought's ICGA Tournaments]
* [http://www.chessgames.com/player/deep_thought.html Deep Thought's games from chessgames.com]
* [http://www.tim-mann.org/deepthought.html Deep Thought from Tim Mann's Chess Pages]
: [http://www.tim-mann.org/DT_eval_tune.tar.gz Source code to tune Deep Thought's evaluation] in tar.gz format.
: [http://www.tim-mann.org/DT_eval_tune.txt Andreas Nowatzyk's explanations of the the source code]
=References=
<references />
'''[[Engines|Up one Level]]'''
[[FILE:deep-thought-i-board.102645419.hsu.jpg|border|right|thumb|link=http://www.computerhistory.org/chess/art-431f4cc1815a3/|Deep Thought I - circuit board <ref>[http://www.computerhistory.org/chess/art-431f4cc1815a3/ Deep Thought I circuit board ca. 1988] Photo by [[Feng-hsiung Hsu]] hosted by [[The Computer History Museum]]</ref> ]]
'''Deep Thought''',<br/>
was a computer chess machine built at [[Carnegie Mellon University]] in the 1980's, the predecessor to [[Deep Blue]]. The project was initially started 1985 as [[Chiptest]] by the computer science doctoral students [[Feng-hsiung Hsu]] and [[Thomas Anantharaman]]. [[Murray Campbell]], former co-developer of [[HiTech]], joined the ChipTest team a few month later - followed by [[Andreas Nowatzyk]], [[Mike Browne]] and [[Peter Jansen]]. The program was named Deep Thought after the fictional computer of the same name <ref>[https://en.wikipedia.org/wiki/The_Hitchhiker%27s_Guide_to_the_Galaxy The Hitchhiker's Guide to the Galaxy from Wikipeadia]</ref> .
=Photos=
[[FILE:deep-thought-team-1988.102645336.hsu.jpg|none|border|text-bottom|640px|link=http://www.computerhistory.org/chess/stl-430b9bbd52f71/]]
[[Murray Campbell]], [[Feng-hsiung Hsu]], [[Thomas Anantharaman]], [[Mike Browne]] and [[Andreas Nowatzyk]],<br/>
after winning the [[Edward Fredkin#Prize|Fredkin Intermediate Prize]] for Deep Thought's Grandmaster-level performance. <ref>[http://www.computerhistory.org/chess/stl-430b9bbd52f71/ Deep Thought team with Fredkin Intermediate Prize] 1988, Gift of [[Feng-hsiung Hsu]] hosted by [[The Computer History Museum]]</ref>
=Achievements=
* In [[Timeline#1988|1988]] Deep Thought and Grandmaster [https://en.wikipedia.org/wiki/Tony_Miles Tony Miles] shared first place in the Software Toolworks Open in Los Angeles. Deep Thought had a 2745 performance rating, and moved its [https://en.wikipedia.org/wiki/United_States_Chess_Federation U.S. Chess Federation] (USCF) rating up to 2551, and qualified for the $10,000 [[Edward Fredkin#Prize|Fredkin Intermediate Prize]] as the first computer to achieve a USCF performance rating of 2500 over a set of 25 contiguous games in human tournaments <ref>[[Hans Berliner]] ('''1989'''). ''Deep Thought Wins Fredkin Intermediate Prize''. AI Magazine Volume 10 Number 2, [http://www.aaai.org/ojs/index.php/aimagazine/article/viewFile/753/671 pdf]</ref>
* In 1988 Deep Thought won the [[ACM 1988|ACM championship in Orlando]]
* In [[Timeline#1989|1989]] Deep Thought won the [[WCCC 1989|6th World Computer Chess Championship in Edmonton]], with a perfect 5-0 score
* In 1989 [[Garry Kasparov]] defeated Deep Thought in a [[Kasparov versus Deep Thought 1989|match by winning 2 games]]
* In 1989 Deep Thought won the [[ACM 1989|ACM championship in Reno]] (tied with [[HiTech]] <ref>[http://groups.google.com/group/rec.games.chess/browse_frm/thread/457406aed770f6be Aegon Tournament 1990; Hitech best overall] by [[Hans Berliner]], [[Computer Chess Forums|rec.games.chess]], May 25, 1990</ref>)
* In 1989 Deep Thought beat International Master [[David Levy]] in a [[Levy versus Deep Thought 1989|match with 4 wins]]
* In 1989 [[IBM]] started working on [[Deep Blue]]
* In [[Timeline#1990|1990]] Deep Thought won the [[ACM 1990|ACM championship in New York City]]
* In [[Timeline#1991|1991]] Deep Thought II won the [[ACM 1991|ACM championship in Albuquerque]]
=Hardware=
[[FILE:DeepThoughtMG.JPG|none|border|text-bottom|640px|link=Kasparov versus Deep Thought 1989#Video]]
[https://en.wikipedia.org/wiki/Photomask Photomask] of the [[ChipTest#MoveGeneration|move generation chip]], a [[Combinatorial Logic|combinational logic]] 8x8 [[Array|array]] <ref>from [[Kasparov versus Deep Thought 1989#Video|Kasparov versus Deep Thought 1989 documentary]], Video 2, 10:49</ref>
=Software=
[[FILE:DeepThoughtHash.JPG|none|border|text-bottom|640px|link=Kasparov versus Deep Thought 1989#Video]]
View into Deep Thought's source written in [[C]] with [[C#Goto|gotos]] <ref>from [[Kasparov versus Deep Thought 1989#Video|Kasparov versus Deep Thought 1989 documentary]], Video 2, 13:35</ref>
=See also=
* [[Chiptest]]
* [[Deep Blue]]
* [[Eval Tuning in Deep Thought]]
* [[Various Classifications#Fiction|Fiction]]
* [[Kasparov versus Deep Thought 1989]]
* [[Levy versus Deep Thought 1989]]
* [[Various Classifications#Thought|Thought]]
=Publications=
* [[Thomas Anantharaman]], [[Murray Campbell]], [[Feng-hsiung Hsu]] ('''1988'''). ''Singular extensions: Adding Selectivity to Brute-Force Searching''. AAAI Spring Symposium, Computer Game Playing, pp. 8-13. Also published in [[ICGA Journal#11_4|ICCA Journal, Vol. 11, No. 4]], republished (1990) in [https://en.wikipedia.org/wiki/Artificial_Intelligence_%28journal%29 Artificial Intelligence], Vol. 43, No. 1, pp. 99-109. ISSN 0004-3702.
* [[Hans Berliner]] ('''1989'''). ''Deep Thought Wins Fredkin Intermediate Prize''. AI Magazine Volume 10 Number 2, [http://www.aaai.org/ojs/index.php/aimagazine/article/viewFile/753/671 pdf]
* [[David Levy]] ('''1990'''). ''The End of an Era''. [[ICGA Journal#13_1|ICCA Journal, Vol. 13, No. 1]] » [[Levy versus Deep Thought 1989]]
* [[Michael Valvo]] ('''1990'''). ''Moral Victory: Karpov versus Deep Thought at Harvard''. [[ICGA Journal#13_1|ICCA Journal, Vol. 13, No. 1]] <ref>[http://www.skepticfiles.org/cowtext/comput~1/karpovpr.htm Karpov vs. DEEP THOUGHT Cambridge, Massachusetts reported by Darren Bedwell, Compuserve 73]</ref>
* [[Feng-hsiung Hsu]], [[Thomas Anantharaman]], [[Murray Campbell]], [[Andreas Nowatzyk]] ('''1990'''). ''Deep Thought''. [[Computers, Chess, and Cognition]], pp. 55-78
* [[Feng-hsiung Hsu]], [[Thomas Anantharaman]], [[Murray Campbell]], [[Andreas Nowatzyk]] ('''1990'''). ''[http://www.disi.unige.it/person/DelzannoG/AI2/hsu.html A Grandmaster Chess Machine]''. [[Scientific American]], Vol. 263, No. 4, pp. 44-50. ISSN 0036-8733.
* [[Frederic Friedel]] ('''1991'''). ''Not the Mother of all Chess Machines''. [[ICGA Journal#14_2|ICCA Journal, Vol. 14, No. 2]] <ref>[https://en.wikipedia.org/wiki/CeBIT CeBIT], [http://www.365chess.com/tournaments/Hannover_1991/18664 Hannover 1991 - 365Chess.com Tournaments]</ref>
* [[Robert Levinson]] ('''1991'''). ''Man and machine, theory and practice square off in Sydney''. [[ICGA Journal#14_3|ICCA Journal, Vol. 14, No. 3]] <ref>[[Conferences#IJCAI1991|12. IJCAI 1991]] and [[Deep Thought]] vs. [https://en.wikipedia.org/wiki/Darryl_Johansen Darryl Johansen] 1-1, [https://en.wikipedia.org/wiki/Sydney Sydney], August 28, 1991</ref> <ref>[http://www.chessgames.com/perl/chess.pl?pid=13728&pid2=47022 Deep Thought vs. Darryl K. Johansen] from [http://www.chessgames.com/index.html chessgames.co]</ref>
* [[Paul Hsieh]] ('''1996'''). ''[[Deep Blue]] - Deep Thought 2''. [[Computer Chess Reports]], Vol 5, No 3+4, pp. 45
=Forum Posts=
==1989==
* [https://groups.google.com/d/msg/rec.games.chess/vzpOWhHfk8c/ThAS2pQQ_rMJ Valvo-DT Match: Move 46] by [[Michael Valvo|Mike Valvo]], [[Computer Chess Forums|rec.games.chess]], March 30, 1989
* [https://groups.google.com/d/msg/rec.games.chess/2Dm3Ps87ALE/6qvBtkRMEuUJ Challange Match] by [[Michael Valvo|Mike Valvo]], [[Computer Chess Forums|rec.games.chess]], March 31, 1989
* [https://groups.google.com/d/msg/rec.games.chess/VMKpRaD9dSc/CLgzuim7pUYJ Valvo-DT Match: Move 48] by [[Michael Valvo|Mike Valvo]], [[Computer Chess Forums|rec.games.chess]], April 01, 1989
* [http://groups.google.com/group/rec.games.chess/browse_frm/thread/3d30a29100dc3fd2/afdb2d7f712f1be2 World Computer Chess Championship (the human side)] by [[Feng-hsiung Hsu]], [[Computer Chess Forums|rec.games.chess]], June 04, 1989 » [[WCCC 1989]]
* [https://groups.google.com/d/msg/rec.games.chess/6Dm8HdxUFM8/hBlVnQkxqBcJ DT - Kasparov : 0-2] by [[Peter Jansen]], [[Computer Chess Forums|rec.games.chess]], October 23, 1989 » [[Kasparov versus Deep Thought 1989]]
* [https://groups.google.com/d/msg/rec.games.chess/P-_Glk_Eta0/zQiLzkpRrq0J Levy - DT match (1)] by [[Peter Jansen]], [[Computer Chess Forums|rec.games.chess]], December 22, 1989 » [[Levy versus Deep Thought 1989]]
* [https://groups.google.com/d/msg/rec.games.chess/9rI-3sgNfXc/eXmmXvTOjOIJ Levy - DT match (2)] by [[Peter Jansen]], [[Computer Chess Forums|rec.games.chess]], December 22, 1989
* [https://groups.google.com/d/msg/rec.games.chess/9wMJRB2iHLw/56JB8LPXFRUJ Levy - DT match (3)] by [[Peter Jansen]], [[Computer Chess Forums|rec.games.chess]], December 23, 1989
* [https://groups.google.com/d/msg/rec.games.chess/ZOBAvN0-29c/HMQiuEePe7MJ Levy - DT match (4)] by [[Peter Jansen]], [[Computer Chess Forums|rec.games.chess]], December 23, 1989
==1990 ...==
* [http://groups.google.com/group/rec.games.chess/browse_frm/thread/763e61b8dd3cb7d9/723ff23220e73f73 Karpov-DT Match, Face to Screen] by [[Feng-hsiung Hsu]], [[Computer Chess Forums|rec.games.chess]], February 04, 1990
* [http://groups.google.com/group/rec.games.chess/browse_frm/thread/195d7f43cbe85c98 Deep Thought] by Thorsten Heedt, [[Computer Chess Forums|rec.games.chess]], April 11, 1995
==2000 ...==
* [https://www.stmintz.com/ccc/index.php?id=128297 Deep Thought's tuning code and eval function!] by [[Severi Salminen]], [[CCC]], September 05, 2000 » [[Eval Tuning in Deep Thought]]
* [https://www.stmintz.com/ccc/index.php?id=386936 Test Position = GM Tony Miles vs Deep Thought, 1989 [14...Bxh2!!]] by [[José Antônio Fabiano Mendes]], [[CCC]], September 09, 2004
=External Links=
* [https://en.wikipedia.org/wiki/Deep_Thought_%28chess_computer%29 Deep Thought from Wikipedia]
* [https://www.game-ai-forum.org/icga-tournaments/program.php?id=349 Deep Thought's ICGA Tournaments]
* [http://www.chessgames.com/player/deep_thought.html Deep Thought's games from chessgames.com]
* [http://www.tim-mann.org/deepthought.html Deep Thought from Tim Mann's Chess Pages]
: [http://www.tim-mann.org/DT_eval_tune.tar.gz Source code to tune Deep Thought's evaluation] in tar.gz format.
: [http://www.tim-mann.org/DT_eval_tune.txt Andreas Nowatzyk's explanations of the the source code]
=References=
<references />
'''[[Engines|Up one Level]]'''
