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@jdart1 jdart1 commented Nov 11, 2023

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@cmgchess
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isnt C54 c3 followed by d4
i checked with chess.com opening list as well

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jdart1 commented Nov 11, 2023

There are many C54 lines without d4. ECO version 4 (old paper copy) has 1. e4 c5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 as the start of the classification (C53 is lines without .. Nf6). Then lines C54/2 through C54/5 have d4, and the rest of the lines have 5. d3. This is also consistent with how ChessBase does classification.

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Ah! I came across yours on Wikipedia. Guess there's a lot of cleaning up to do then

@niklasf niklasf merged commit e6b3f15 into lichess-org:master Nov 13, 2023
@jdart1 jdart1 deleted the C54-fix branch November 18, 2023 19:11
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3 participants