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What does "ECO" mean?
What does "ECO" mean?
Updated over 7 months ago

ECO stands for the Encyclopedia of Chess Openings, which provides the most common system for categorizing all chess openings.

Despite having only 500 codes (from A00-E99), the system does a good job of segmenting openings. These codes help to organize chess games and openings, especially in game databases.

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