High Quality Content by WIKIPEDIA articles The Encyclopaedia of Chess Openings (ECO) is a classification system for the opening moves in a game of chess. It is presented as a five volume book collection (now also a computer database) describing chess openings. The moves were taken from hundreds of thousands of games between masters, from published analysis in the Chess Informant since 1966, and then compiled by notable chess players. The main editor is Aleksandar Matanovic. Both the ECO and the Chess Informant are published by the Serbian company Sahovski Informator (Chess Informant). These openings are typically provided in an ECO table that concisely presents the best opening lines.
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