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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.

ECO Vol.B
ECO Vol.B

Encyclopedia Volume BChess Informant's ECO Volume B (B00-B99) was first published in 1975.


ECO Vol.B
ECO B0-B9
ECO B0-B9
B00-B99; Encyclopedia of Chess Openings (ECO) Volume B: B00-B99

Contents:

  • 1.e4 without 1...c5, 1...e6, 1...e5
  • 1.e4 c5


ECO B0-B9
B00-09
B00-09

B0 : 1.e4 without 1...c6, 1...c5, 1...e6, 1...e5


B00-09
B10-19
B10-19

B1 : 1.e4 c6


B10-19
B20-29
B20-29

B2 : 1.e4 c5

  • without 2.Nf3
  • 2.Nf3 without 2...Nc6, 2...e6, 2...d6


B20-29
B30-39
B30-39

B3 : 1.e4 c5 2.Nf3 Nc6


B30-39
B40-49
B40-49

B4 : 1.e4 c5 2.Nf3 e6


B40-49
B50-59
B50-59

B5 : 1.e4 c5 2.Nf3 d6

  • without 3.d4
  • 3.d4 without 3...cd4
  • 3...cd4 without 4.Nd4
  • 4.Nd4 without 4...Nf6
  • 4...Nf6 without 5.Nc3
  • 5.Nc3 without 5...Nc6, 5...g6, 5...e6, 5...a6
  • 5...Nc6 without 6.Bg5


B50-59
B60-69
B60-69

B6 : 1.e4 c5 2.Nf3 d6 3.d4 cd4 4.Nd4 Nf6 5.Nc3 Nc6 6.Bg5


B60-69
B70-79
B70-79

B7 : 1.e4 c5 2.Nf3 d6 3.d4 cd4 4.Nd4 Nf6 5.Nc3 g6


B70-79
B80-89
B80-89

B8 : 1.e4 c5 2.Nf3 d6 3.d4 cd4 4.Nd4 Nf6 5.Nc3 e6


B80-89
B90-99
B90-99

B9 : 1.e4 c5 2.Nf3 d6 3.d4 cd4 4.Nd4 Nf6 5.Nc3 a6


B90-99

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