Fabien Letouzey

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Fabien Letouzey, a French computer chess and games programmer and developer of the chess programs Fruit, Chess-64 and Senpai, the Othello programs Turtle, Snail , Piloth , Decapus (10x10) and Octopus (8x8), the latter Gold medal winners at the 20th Computer Olympiad, Leiden 2017, the UCI-Winboard adapter PolyGlot, and the International Draughts programs Toy , and Scan, which surprised the Draughts scene in winning the 18th Computer Olympiad, Leiden 2015, and defended its title in 2016 and 2017 respectively. Fabien further works with Rémi Coulom to improve his Go playing program Crazy Stone due to deep learning.

=Fruit= The release of Fruit until version 2.1 under GNU General Public License was a "revolution" in computer chess in 2005 - an open source program was "suddenly" competitive with the long time leading programs Shredder and Junior, as demonstrated at the WCCC 2005, where Fruit became runner up behind Zappa. After the great success of Reykjavik, and Fabien Letouzey met his professional colleagues, he decided to close the source and to go commercial - short after Fruit derivate appeared, based on the source code of Fruit 2.1, most notably Toga by Thomas Gaksch. Fabien finished his commercial computer chess career so far in 2007. Fruit 2.3+ is non GPL with full rights given to Ryan Benitez, while Fruit 2.1 is now owned by the Free Software Foundation.

=Anniversary= In March 2014, ten years after the initial Fruit 1.0 release, Fabien announced and published his new open source engine Senpai, and an independent fork of Fruit 2.1, Fruit Reloaded by Fabien Letouzey, Daniel Mehrmann and Ryan Benitez , both hosted by Steve Maughan's Computer Chess Programming.

=Photos=

Fruit
Winners 2005, Stefan Meyer-Kahlen, Fabien Letouzey, Anthony Cozzie and Gian-Carlo Pascutto

Scan
10 years later, Fabien's program Scan won 10x10 Draughts at the 18th Computer Olympiad and defended its title at the 19th and 20th Computer Olympiad so far

=Selected Publications=
 * Francesco de Comité, François Denis, Rémi Gilleron, Fabien Letouzey (1999). Positive and Unlabeled Examples help Learning, The 10th International Conference on Algorithmic Learning Theory, available as ps
 * Fabien Letouzey, François Denis, Rémi Gilleron (2000). Learning from Positive and Unlabeled Examples. ALT 2000: 71-85, available as ps
 * François Denis, Rémi Gilleron, Fabien Letouzey (2005). Learning from positive and unlabeled examples. Theor. Comput. Sci. 348(1): 70-83

=Forum Posts=

2000 ...

 * calculating the PV using MTD by Fabien Letouzey, CCC, September 11, 2002 »  MTD(f), Principal variation
 * Re: Fruit - Question for Fabien by Fabien Letouzey, CCC, March 11, 2004 » Node Types, Transposition Table, Principal Variation Search
 * Fruit, trying to answer various missed posts by Fabien Letouzey, CCC, March 15, 2004
 * Fruit 1.0 UCI (with source code) now available by Fabien Letouzey, CCC, March 17, 2004

2005 ...

 * Safe I/O (repeated) by Fabien Letouzey, Winboard Forum, February 11, 2005
 * To Fruit's author Fabien Letouzey and commercial manager Joachim Rang by Marc Lacrosse, CCC, November 17, 2005

2010 ...

 * Fabien's open letter to the community by Tord Romstad, CCC, January 23, 2011 » Fabien Rybka Letter
 * Fabien's open letter to the community by Tord Romstad, OpenChess Forum, January 23, 2011
 * Interview with Fabien (from the year 2005) ... by Frank Quisinsky, CCC, January 25, 2011
 * What is a derivative? by Fabien Letouzey, CCC, January 27, 2011 » Clones
 * GPL / GNU Licence enforcement by Fabien Letouzey, CCC, January 27, 2011 » Free Software Foundation
 * Programming language features for computer chess by Fabien Letouzey, CCC, January 27, 2011
 * Senpai 1.0 (new engine) by Fabien Letouzey, CCC, March 17, 2014
 * Fruit 1.0 anniversary by Fabien Letouzey, CCC, March 17, 2014

2015 ...

 * Re: Draughts at the ICGA Olympiad by Fabien Letouzey, CCC, April 30, 2015
 * A little more info about Scan by Fabien Letouzey by Jesús Muñoz, CCC, July 06, 2015
 * Scan by Fabien Letouzey, World Draughts Forum, July 08, 2015

=External Links=
 * Fabien Letouzey's ICGA Tournaments
 * The alternative to Crafty, Interview with Fabien Letouzey by Frank Quisinsky, Arena Chess GUI 3.0 - Archive, Page 7, 96, April 05, 2005, also hosted by Ed Schröder
 * Senpai Chess Engine - Computer Chess Programming hosted by Steve Maughan
 * Fruit Reloaded - Computer Chess Programming hosted by Steve Maughan
 * Scan hosted by Harm Jetten

=References=

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