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The **Chess Query Language** (CQL) is a structured [|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 and is free. The CQL Manual is hosted by the [|Internet Archive].

The current version is **5.1** and the documentation and download of the executable can be found on the website of Gady Costeff.

=Sample query= code (match :pgn input.pgn      :output output.pgn       :forany piece [Rr]       (position $piece[g2] :and (             (position :gappedsequence ((position :movefrom $piece[g6,d2] :moveto ?g2)))              (position :gappedsequence ((position :movefrom $piece[d6,g2] :moveto ?d2)))              (position :gappedsequence ((position :movefrom $piece[d6,g2] :moveto ?g6)))              (position :gappedsequence ((position :movefrom $piece[g6,d2] :moveto ?d6)))             ) :shift :flip ) ) code
 * look for positions where a rook circles in a 4x3 rectangle
 * we use the rectangle g2, d2, d6, g6 together with shift and flip

=See also=
 * Portable Game Notation
 * SCID

=Publications=
 * Gady Costeff (**2004**). //The Chess Query Language: CQL//. ICGA Journal, Vol. 27, No. 4, [|pdf]

=Forum Posts=
 * [|CQL Users?] by Guy Haworth, CCC, August 11, 2004
 * [|CQL - Stalemate with 2 pieces pinned] by James Constance, CCC, July 17, 2005
 * [|Chess Query Language] by David Dahlem, CCC, August 13, 2011
 * [|Chess Query Language] by Giovanni Lavorgna, CCC, May 07, 2016
 * [|Scid vs PC with CQL, build issue] by Steven Atkinson, CCC, November 25, 2017 » Scid vs. PC

=External Links=
 * [|CQL Introduction] by Gady Costeff
 * [|CQL Manual] hosted by the [|Internet Archive]
 * [|Chess Query Language] from [|Tim Krabbé's] Chess Site
 * [|Chess Query Language from Wikipedia]
 * [|CQL VisualCQL] by Emil Vlasák

=References= =What links here?= include page="Chess Query Language" component="backlinks" limit="80"
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