List of ECO codes

This is a list of the codes used to classify chess openings in the Encyclopaedia of Chess Openings. The five-volume encyclopaedia was first published by Chess Informant between 1974 and 1979, under the editorship of Aleksandar Matanović. The moves given below are primarily those found in the first edition. Subsequent editions have introduced some changes, and this is indicated where appropriate.

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