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The '''Chess Query Language''' (CQL) is a structured [https://en.wikipedia.org/wiki/Query_language query language] to search for games, problems, and studies that match specific themes from a collection in [[Portable Game Notation]]. CQL was developed by [[Gady Costeff]] and [[Lewis Stiller]]. It is Copyright (c) 2003-2018 2021 and is free. The CQL Manual is hosted by the [https://en.wikipedia.org/wiki/Internet_Archive Internet Archive] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=60090 Chess Query Language] by Giovanni Lavorgna, [[CCC]], May 07, 2016</ref> <ref>[https://web.archive.org/web/20140130143815/http://www.rbnn.com/cql/ CQL Manual] hosted by the [https://en.wikipedia.org/wiki/Internet_Archive Internet Archive]</ref> . The current version is '''56.1''' and the documentation and download of the executable can be found on the website of Gady Costeff <ref>[http://www.gadycosteff.com/cql/doc/introduction.html CQL Introduction] by [[Gady Costeff]]</ref>.

* [http://www.gadycosteff.com/cql/doc/introduction.html CQL Introduction] by [[Gady Costeff]]* [httphttps://wwwweb.arvesarchive.org/arvesweb/20140130143815/http://indexwww.rbnn.phpcom/encql/magazine-eg/chess-query-language-5 Chess Query Language 5CQL Introduction] from hosted by the [https://deen.wikipedia.org/wiki/ARVES ARVESInternet_Archive Internet Archive]* [httpshttp://webwww.archivearves.org/webarves/20140130143815/http:index.php/en/www.rbnn.comendgamestudies/cql/ -sample-files Sample CQL Manualfiles about themes or manoeuvres and with some studies shown as results] hosted by the from [https://ende.wikipedia.org/wiki/Internet_Archive Internet ArchiveARVES ARVES]* [http://www.xs4all.nl/~timkr/chess2/cql.htm Chess Query Language] from [https://en.wikipedia.org/wiki/Tim_Krabb%C3%A9 Tim Krabbé's] Chess Site(March 2004)