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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 2019 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 '''56.10''' and the documentation and download of the executable can be found on the website of Gady Costeff <ref>[http://www.gadycosteff.com/cql/doc/introductionindex.html CQL Introduction] by [[Gady Costeff]]</ref>.

* [http://www.gadycosteff.com/cql/doc/introductionindex.html CQL Introduction] by [[Gady Costeff]]* [https://web.archive.org/web/20140130143815/http://www.rbnn.com/cql/ CQL ManualIntroduction] hosted by the [https://en.wikipedia.org/wiki/Internet_Archive Internet Archive]* [http://www.arves.org/arves/index.php/en/endgamestudies/cql-sample-files Sample CQL files about themes or manoeuvres and with some studies shown as results] from [https://de.wikipedia.org/wiki/ARVES 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)