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The Encyclopedia of Chess Openings (ECO) codes, for example B70 to B79 for the Sicillian Dragon https://www.365chess.com/eco/B70-B79_Sicilian_dragon_variation h
by Bostonian 4y ago
The Encyclopedia of Chess Openings (ECO) codes, for example B70 to B79 for the Sicillian Dragon https://www.365chess.com/eco/B70-B79_Sicilian_dragon_variation https://www.365chess.com/eco/B70-B79_Sicilian_dragon_variati..., were a major advance. They were invented in the 1960s, and the popularity of openings has changed since then, so subdivision of some codes, perhaps by appending decimals to the current system, would be a good thing.