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According to the page source the codes the sections cover are: King pawn openings, ECO Codes C20- C99 The French Defence, ECO Codes C00- C19, A04 & A08 The Dragon, ECO Codes B27, B34- B39 & B70-B79 Open Sicilians, ECO Codes B32- B33, B40-B69 & B80-B99 Anti-Sicilians, ECO Codes B20- B31, & B50-B55 1 e4 Various, ECO Codes B00- B19 1 d4 d5, ECO Codes D06- D07, D10-D69 & E01-E09 Other d-pawn Openings, ECO Codes A45-A49, & D00-D05 KID, ECO Codes A41- A42, A53-A55, A68-A69 & E60-E69 Nimzo-Indian, QI, Bogo & Benonis, ECO Codes A43-A44, A56, A60-A67, A70-A79, E00 & E11-E59 Dutch, Grunfeld and other Daring Defences, ECO Codes A40, A50-A52, A57-A59, A80-A89, B00, D08-D09, D71-D99 & E10 Flank Openings, ECO Codes A00- A39, without A08
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