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ECO at a Glance
Chess Informant's Encyclopedia of Chess Openings (ECO) is a universal classification for chess openings

The acronym ECO (Encyclopedia of Chess Openings) refers to two different but related concepts:-

  • A five volume reference (A-E) published by Chess Informant; and
  • A system of chess opening classification using codes A00-E99.

Each volume of the Encyclopedia covers 100 codes, e.g. Volume A covers A00-A99. This image gallery shows the ten single digit codes, e.g. A0-A9, covered by each volume.

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ECO Vol.C
ECO Vol.C

Encyclopedia Volume CChess Informant's ECO Volume C (C00-C99) was first published in 1974.


ECO Vol.C
 		ECO C0-C9
ECO C0-C9

C00-C99; Encyclopedia of Chess Openings (ECO) Volume C: C00-C99

Contents:

  • 1.e4 e6
  • 1.e4 e5


ECO C0-C9
 		C00-09
C00-09

C0 : 1.e4 e6

  • without 2.d4
  • 2.d4 without 2...d5
  • 2...d5 without 3.Nc3


C00-09
 		C10-19
C10-19

C1 : 1.e4 e6 2.d4 d5 3.Nc3


C10-19
C20-29
C20-29

C2 : 1.e4 e5 without 2.f4, 2.Nf3


C20-29
 		C30-39
C30-39

C3 : 1.e4 e5 2.f4


C30-39
 		C40-49
C40-49

C4 : 1.e4 e5 2.Nf3

  • without 2...Nc6
  • 2...Nc6 without 3.Bc4, 3.Bb5


C40-49
 		C50-59
C50-59

C5 : 1.e4 e5 2.Nf3 Nc6 3.Bc4


C50-59
C60-69
C60-69

C6 : 1.e4 e5 2.Nf3 Nc6 3.Bb5

  • without 3...a6
  • 3...a6 without 4.Ba4


C60-69
 		C70-79
C70-79

C7 : 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4

  • without 4...Nf6
  • 4...Nf6 without 5.0-0
  • 5.0-0 without 5...Ne4, 5...Be7


C70-79
 		C80-89
C80-89

C8 : 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0

  • 5...Ne4
  • 5...Be7 without 6.Re1
  • 6.Re1 without 6...b5
  • 6...b5 7.Bb3 without 7...d6


C80-89
 		C90-99
C90-99

C9 : 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6


C90-99
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