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List_of_ECO_codes entered the ranking for the first time today at position #. This is its highest position ever recorded.
This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-05-18 and was most recently seen on 2026-05-18.
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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