ECO at a Glance

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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.B Encyclopedia Volume BChess Informant's ECO Volume B (B00-B99) was first published in 1975. ECO Vol.B	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 B0 : 1.e4 without 1...c6, 1...c5, 1...e6, 1...e5 B00-09	B10-19 B1 : 1.e4 c6 B10-19
B20-29 B2 : 1.e4 c5 without 2.Nf3 2.Nf3 without 2...Nc6, 2...e6, 2...d6 B20-29	B30-39 B3 : 1.e4 c5 2.Nf3 Nc6 B30-39	B40-49 B4 : 1.e4 c5 2.Nf3 e6 B40-49	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 B6 : 1.e4 c5 2.Nf3 d6 3.d4 cd4 4.Nd4 Nf6 5.Nc3 Nc6 6.Bg5 B60-69	B70-79 B7 : 1.e4 c5 2.Nf3 d6 3.d4 cd4 4.Nd4 Nf6 5.Nc3 g6 B70-79	B80-89 B8 : 1.e4 c5 2.Nf3 d6 3.d4 cd4 4.Nd4 Nf6 5.Nc3 e6 B80-89	B90-99 B9 : 1.e4 c5 2.Nf3 d6 3.d4 cd4 4.Nd4 Nf6 5.Nc3 a6 B90-99

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