Stable-9%1974
Encyclopaedia of Chess Openings
by various authors
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About This Book
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 Yugoslavian company Šahovski Informator. It is currently undergoing its fifth edition. ECO may also refer to the opening classification system used by the encyclopedia.
Summary sourced from Wikipedia under CC BY-SA 4.0.
