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ECO stands for Encyclopaedia of Chess Openings. An opening has an ECO code that begins with a letter A-E then a number 00 to 99. For instance the ECO code for the Latvian counter-gambit is C40, while the ECO codes for the Caro-Kann defenses are B10-B19. Unusual openings like the creepy crawly formation are categorized under A00.
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