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'''[[Main Page|Home]] * [[Engines]] * Alexs'''

a chess program by [[Alex van Tiggelen]], apparently an application of ALEXS (Automatically Learning EXpert System), a [[Neural Networks|neural network]] approach with a learning efficiency beyond of [[Genetic Programming|genetic learning]],

as elaborated and demonstrated by Alex van Tiggelen and [[Jaap van den Herik]] at [[Advances in Computer Chess 6]] in the domain of specific [[Endgame|endgames]], in particular the endgame of two knights versus h-pawn <ref>[[Alex van Tiggelen]], [[Jaap van den Herik]] ('''1991'''). ''ALEXS: An Optimization Approach for the Endgame KNNKP(h)''. [[Advances in Computer Chess 6]]</ref>, and by Van Tiggelen casted to the [[Middlegame|middlegame]] <ref>[[Alex van Tiggelen]] ('''1991'''). ''Neural Networks as a Guide to Optimization - The Chess Middle Game Explored''. [[ICGA Journal#14_3|ICCA Journal, Vol. 14, No. 3]]</ref>. Alexs played the [[DOCCC 1996]] and the [[DOCCC 1998]], according to [[Vincent Diepeveen]] <ref>[https://www.stmintz.com/ccc/index.php?id=43505 Re: Review of ALEXS by Larry Kaufman] by [[Vincent Diepeveen]], [[CCC]], February 17, 1999</ref> <ref>[http://www.talkchess.com/forum/viewtopic.php?topic_view=threads&p=318017&t=31545 Re: Chess program with Artificial Neural Networks (ANN)?] by [[Vincent Diepeveen]], [[CCC]], January 11, 2010</ref> it was based on the Dutch [[Nightmare NL|Nightmare]] by [[Joost Buijs]], with an [[Automated Tuning|automatically tuned]] [[Evaluation|evaluation]] in 1996, but manually tuned parameters in 1998. A time-served version of Alexs was commercially available through [[Gambit-Soft]] in 1999 <ref>[https://www.stmintz.com/ccc/index.php?id=43056 Review of ALEXS by Larry Kaufman] by [[Đorđe Vidanović]], [[CCC]], February 12, 1999</ref>.

=Forum Posts=

* [https://www.stmintz.com/ccc/index.php?id=43056 Review of ALEXS by Larry Kaufman] by [[Đorđe Vidanović]], [[CCC]], February 12, 1999

* [https://www.stmintz.com/ccc/index.php?id=138920 Alexs 1.0] by Marc van Hal, [[CCC]], November 15, 2000

* [http://www.talkchess.com/forum/viewtopic.php?topic_view=threads&p=318017&t=31545 Re: Chess program with Artificial Neural Networks (ANN)?] by [[Vincent Diepeveen]], [[CCC]], January 11, 2010