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==Stockfish==
In March 2020, an anonymous poster who came into possession of Houdini 6's source code, apparently due to access to a [https://en.wikipedia.org/wiki/Apache_Subversion subversion] server owned by Robert Houdart, claimed Houdini 5 and 6 were [[Stockfish]] derivatives <ref>[http://www.talkchess.com/forum3/viewtopic.php?f=10&t=73433 Houdini is a Stockfish Derivative (and started life as a Robbolito derivative)] by cucumber, [[CCC]] (Engine Origins requires registration), March 22, 2020</ref> <ref>[https://groups.google.com/d/msg/fishcooking/DygaIdBvJm0/cjtMosvdBQAJ Houdini is a clone of Stockfish 8] by c9publice...@gmail.com, [[Computer Chess Forums|FishCooking]], March 26, 2020</ref>.In summer 2021, the Stockfish team filed a [https://en.wikipedia.org/wiki/Lawsuit lawsuit] against [[ChessBase]] to enforce the consequences of the license termination concerning [[Fat Fritz#Fat Fritz 2|Fat Fritz 2]] and the allegedly Stockfish derivative Houdini 6 sold by ChessBase <ref>[https://stockfishchess.org/blog/2021/our-lawsuit-against-chessbase/ Our lawsuit against ChessBase], [[Stockfish|The Stockfish team]], [[Computer Chess Forums|Stockfish Blog]], July 20, 2021</ref> <ref>[http://www.talkchess.com/forum3/viewtopic.php?f=2&t=77762&start=239 Re: Stockfish: Our lawsuit against ChessBase] by [[Andrew Grant]], [[CCC]], July 24, 2021</ref> <ref>[https://github.com/crossopterygian/Houdini_6 GitHub - crossopterygian/Houdini_6: uci chess engine]</ref>.
=Release Dates=
* [https://en.wikipedia.org/wiki/Walter_B._Gibson Walter Brown Gibson], [http://archives.library.illinois.edu/archon/?p=creators/creator&id=2380 Morris N. Young] ('''1953'''). ''[https://books.google.com/books?id=WqAlWYtemkIC Houdini on Magic]''. [https://en.wikipedia.org/wiki/Dover_Publications Dover Publications]
=Forum PostsPostings=
==2010 ...==
* [http://www.talkchess.com/forum/viewtopic.php?topic_view=threads&p=348905&t=34326 Re: Costeff Study 1979] by [[Robert Houdart]], [[CCC]], May 16, 2010
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=73630 An Old Engine] by [[Michael Byrne|MikeB]], [[CCC]], April 11, 2020
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=75040&start=44 Re: Is cloning a hobby?] by [[Andrew Grant]], [[CCC]], September 17, 2020
* [https://stockfishchess.org/blog/2021/our-lawsuit-against-chessbase/ Our lawsuit against ChessBase], [[Stockfish|The Stockfish Team]], [[Computer Chess Forums|Stockfish Blog]], July 20, 2021 » [[ChessBase]], [[Fat Fritz#Fat Fritz 2|Fat Fritz 2]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=77762&start=239 Re: Stockfish: Our lawsuit against ChessBase] by [[Andrew Grant]], [[CCC]], July 24, 2021
=External Links=
==Chess Engine==
* [http://www.cruxis.com/chess/houdini.htm Houdini Chess Engine]
* [https://web.archive.org/web/20100519120411/http://www.cruxis.com/chess/houdini.htm Houdini Chess Engine] ([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine], May 19, 2010)
* [https://en.wikipedia.org/wiki/Houdini_%28chess%29 Houdini (chess) from Wikipedia]
===Purchase===
* [https://shop.chessbase.com/en/products/houdini_6_pro_multiprocessor_version Houdini 6 Pro] [[ChessBase|ChessBase Shop]], September 17, 2017
* [https://shop.chessbase.com/en/products/houdini_5_pro_multiprocessor_version Houdini 5 Pro] [[ChessBase|ChessBase Shop]], December 02, 2016
