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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 ^{[1] [2]} .

The current version is 5.1 and the documentation and download of the executable can be found on the website of Gady Costeff ^[3].

Sample query

^{[4] [5]}

;; look for positions where a rook circles in a 4x3 rectangle
;; we use the rectangle g2, d2, d6, g6 together with shift and flip
;;
(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
       )
)

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

1. ^ Chess Query Language by Giovanni Lavorgna, CCC, May 07, 2016
2. ^ CQL Manual hosted by the Internet Archive
3. ^ CQL Introduction by Gady Costeff
4. ^ Sample CQL files (Internet Archive)
5. ^ An html version of rookrectangle.cql (Internet Archive)

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