Encyclopedia of Chess Opening codes.

This page contains our ECO lookup tool [beta], to help enthusiasts learn more about Chess Openings!  This free-to-use utility, is the perfect way to find new variations, learn move orders, and more!  Please click on the introduction video, beneath, for a simple overview on the features and benefits.

Our 2 comprehensive databases can be searched by move, by code, or by name. Our dataset includes 1 x British and 1 x American source, so check both spellings of words (e.g. British = Defence; American = Defense), etc. If you get identical results, for a particular query – don’t panic – this just means the results were found in both of our databases.