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[[FILE:Joker black 02.svg|border|right|thumb|180px|Joker playing card <ref>[https://commons.wikimedia.org/wiki/File:Joker_black_02.svg Joker playing card] in [https://en.wikipedia.org/wiki/Scalable_Vector_Graphics SVG] based on the french representation. This card has been made with [https://en.wikipedia.org/wiki/GNOME GNOME] [https://en.wikipedia.org/wiki/GNOME_Games_Collection games] in mind and has been successfully tested with Nautilus, [https://en.wikipedia.org/wiki/Eye_of_GNOME Eye of Gnome] (both of them use [https://en.wikipedia.org/wiki/Librsvg librsvg]) and [https://en.wikipedia.org/wiki/Inkscape Inkscape]. Author: [http://svg-cards.sourceforge.net/ David Bellot] - [https://en.wikipedia.org/wiki/Berkeley,_California Berkeley, CA], USA, August 12, 2005, [https://commons.wikimedia.org/wiki/Joker Joker - Wikimedia Commons]</ref> ]]
The French program '''Joker''' was a variation of the [[Écume]] chess engine by [[Marc-François Baudot]] and [[Jean-Christophe Weill]]. The idea behind it was "Entropic extension", if the position was not stable enough, an [[Extensions|extension]] of the search was made (the stability was considered as a function of the last move)<ref>[http://recherche.enac.fr/~weill/chess.html A Short Story of JCW's Computer Chess Program] by [[Jean-Christophe Weill]]</ref>. The idea came from [[Vincent David|Vincent David's]] Ph.D. thesis <ref>[[Vincent David]] ('''1993'''). ''[http://catwww.inisttheses.fr/?aModele=afficheN&cpsidt=161774 1993ESAE0008 Algorithmique parallèle sur les arbres de décision et raisonnement en temps contraint. Etude et application au Minimax]'' = Parallel algorithm for heuristic tree searching and real-time reasoning. Study and application to the Minimax, Ph.D. Thesis, [https://en.wikipedia.org/wiki/%C3%89cole_nationale_sup%C3%A9rieure_de_l%27a%C3%A9ronautique_et_de_l%27espace École nationale supérieure de l'aéronautique et de l'espace], [https://en.wikipedia.org/wiki/Toulouse Toulouse], [https://en.wikipedia.org/wiki/France France]</ref>.
Joker won the [[FCCC 1993|2nd French Computer Chess Championship]]. Écume hold the second place. Joker did show some impressive play, also at [[Aegon 1994]], but the idea was abandoned, the search was too slow (Even if it was coded in [[Assembly|assembly language]]).
=Namesake=
