Encyclopaedia of Chess Openings
Reference work on chess openings / From Wikipedia, the free encyclopedia
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The Encyclopaedia of Chess Openings (ECO) is a reference work describing the state of opening theory in chess, originally published in five volumes from 1974 to 1979 by the Serbian company Šahovski Informator (Chess Informant). It is currently undergoing its fifth edition. ECO may also refer to the opening classification system used by the encyclopedia.
This article uses algebraic notation to describe chess moves.