Encyclopaedia of Chess Openings

First edition of ECO volume E. The title is given in eight languages. In the center are the two openings included in the volume: 1.d4 Nf6 2.c4 e6; and 1.d4 Nf6 2.c4 g6 without (symbol ┘) an early ...d7–d5.

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.


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