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Chess Query Language (CQL) is a structured query language which is designed to allow chess players and researchers to search for games, positions, problems, and studies in a quick and relatively easy manner. The user specifies the items that they are looking for, and the database in which to search. After running, the query creates a file in Portable Game Notation (PGN) format that contains all the games or positions matching the query criteria. The language is designed to be extremely flexible; for example, a user does not have to define ''exactly'' the position or theme that they are looking for, but can modify the query so that it will find similar results within certain parameters.〔(Chess Query Language example ) Tim Krabbé's Chess Site - Retrieved on 2007-07-04〕 Items and themes that CQL can search for include, but are not limited to:〔(CQL criteria ) convecta.com Retrieved on 2007-07-04〕 * Player names * Date and location of games * Chess opening used * Certain moves or combinations of moves * Certain pieces located on certain squares * Patterns of pieces in certain locations * Which pieces each side has left * Complex criteria such as king safety or certain pawn structures. ==References== 〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Chess Query Language」の詳細全文を読む スポンサード リンク
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