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a popular opening book format that allows chess engines to play quickly in the opening period. The format and relative tools are developed by [[Fabien Letouzey]]. 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.