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.D Encyclopedia Volume DChess Informant's ECO Volume D (D00-D99) was first published in 1976. ECO Vol.D	ECO D0-D9 D00-D99; Encyclopedia of Chess Openings (ECO) Volume D: D00-D99 Contents: 1.d4 d5 1.d4 Nf6 2.c4 g6 with 3...d5 ECO D0-D9	D00-09 D0 : 1.d4 d5 without 2.c4 2.c4 without 2...c6, 2...dc4, 2...e6 D00-09	D10-19 D1 : 1.d4 d5 2.c4 c6 D10-19
D20-29 D2 : 1.d4 d5 2.c4 dc4 D20-29	D30-39 D3 : 1.d4 d5 2.c4 e6 without 3.Nc3 3.Nc3 without 3...Nf6 3...Nf6 without 4.Nf3, 4.Bg5 4.Nf3 without 4...c5, 4...c6 D30-39	D40-49 D4 : 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 4...c5 4...c6 D40-49	D50-59 D5 : 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 without 4...Be7 4...Be7 without 5.e3 5.e3 without 5...0-0 5...0-0 without 6.Nf3 6.Nf3 without 6...Nbd7 D50-59
D60-69 D6 : 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 0-0 6.Nf3 Nbd7 D60-69	D70-79 D7 : 1.d4 Nf6 2.c4 g6 (with 3...d5) without 3.Nc3 D70-79	D80-89 D8 : 1.d4 Nf6 2.c4 g6 3.Nc3 d5 without 4.Nf3 D80-89	D90-99 D9 : 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 D90-99

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