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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.A
ECO Vol.A

Encyclopedia Volume A • Chess Informant's ECO Volume A (A00-A99) was first published in 1979.


ECO Vol.A
 		ECO A0-A9
ECO A0-A9

Encyclopedia of Chess Openings (ECO) Volume A: A00-A99

Contents:

  • Without 1.d4, 1.e4
  • 1.d4 without 1...Nf6, 1...d5
  • 1.d4 Nf6 without 2.c4
  • 1.d4 Nf6 2.c4 without 2...e6, 2...g6


ECO A0-A9
 		A00-09
A00-09

A0 : Without 1.c4, 1.d4, 1.e4


A00-09
 		A10-19
A10-19

A1 : 1.c4 without 1...e5, 1...c5


A10-19
A20-29
A20-29

A2 : 1.c4 e5


A20-29
 		A30-39
A30-39

A3 : 1.c4 c5


A30-39
 		A40-49
A40-49

A4 : 1.d4

  • without 1...Nf6, 1...f5, 1...d5
  • 1...Nf6 without 2.c4


A40-49
 		A50-59
A50-59

A5 : 1.d4 Nf6 2.c4

  • without 2...c5, 2...e6, 2...g6
  • 2...c5 without 3.d5
  • 3.d5 without 3...e6


A50-59
A60-69
A60-69

A6 : 1.d4 Nf6 2.c4 c5 3.d5 e6

  • without 4.Nc3
  • 4.Nc3 without 4...ed5
  • 4...ed5 without 5.cd5
  • 5.cd5 without 5...d6
  • 5...d6 without 6.e4
  • 6.e4 without 6...g6
  • 6...g6 without 7.Nf3


A60-69
 		A70-79
A70-79

A7 : 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 ed5 5.cd5 d6 6.e4 g6 7.Nf3


A70-79
 		A80-89
A80-89

A8 : 1.d4 f5

  • without 2.c4
  • 2.c4 without 2...Nf6
  • 2...Nf6 without 3.g3
  • 3.g3 without 3...e6


A80-89
 		A90-99
A90-99

A9 : 1.d4 f5 2.c4 Nf6 3.g3 e6


A90-99
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