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an adapter <ref>[https://en.wikipedia.org/wiki/Adapter_pattern Adapter pattern from Wikipedia]</ref> that allows [[UCI]] engines to use interfaces and [[GUI|GUIs]] supporting the [[Chess Engine Communication Protocol]], developed by [[Fabien Letouzey]] and modified by [[Fonzy Bluemers]] <ref>[https://web.archive.org/web/20150213221910/http://wbec-ridderkerk.nl/html/info.htm Information and rules to participate] from [[WBEC|WBEC Ridderkerk]] ([https://en.wikipedia.org/wiki/Internet_Archive Internet Archive])</ref>. Polyglot is open source, licensed under the [[Free Software Foundation#GPL|GPL]], and is able to run on various operating systems, which allows to run UCI engines not only under [[Windows]] with its native chess GUIs, but also under [[Linux]] and [[Mac OS]] using [[XBoard]]. PolyGlot 1.4 provides a simplistic [[Opening Book|opening book]] implementation <ref>[http://hardy.uhasselt.be/Toga/book_format.html Polyglot book format] by [[Michel Van den Bergh]]</ref>, referred as '''bin'''-opening book format.