The Encyclopaedia of Chess Openings (ECO) is a classification system for the opening moves in a game of chess. It is presented as a five volume book collection (now also a computer database) describing chess openings. The moves were taken from hundreds of thousands of games between masters, from published analysis in the Chess Informant since 1966, and then compiled by notable chess players. Both the ECO and the Chess Informant are published by the Serbian company Šahovski informator (homepage). These openings are typically provided in an ECO table that concisely presents the best opening lines. A chess opening is the group of initial moves of a chess game (the opening moves). ... Chess Informant (Å ahovski Informator) is a publishing company that periodically produces a book of the same name, as well as the Encyclopaedia of Chess Openings, Encyclopaedia of Chess Endings, Opening Monographs, other print publications, and software (including electronic editions of all most print publications. ... Not to be confused with Republika Srpska. ... Chess Informant (Å ahovski Informator) is a publishing company that periodically produces a book of the same name, as well as the Encyclopaedia of Chess Openings, Encyclopaedia of Chess Endings, Opening Monographs, other print publications, and software (including electronic editions of all most print publications. ... This article is being considered for deletion in accordance with Wikipedias deletion policy. ...

Instead of the traditional names for the openings, ECO has developed a unique coding system that has also been adopted by other chess publications. There are five main categories, "A" to "E", each of which is divided into one hundred sub-categories.

Main ECO codes

See list of chess openings for full details. This is a list of chess openings by the ECO classification: See also Chess and chess openings. ...

A

• White first moves other than 1.e4, 1.d4: Irregular openings (A00-A39)
• 1.d4 without 1...d5, 1...Nf6: Atypical replies to 1.d4 (A40-A44)
• 1.d4 Nf6 without 2.c4: Atypical replies to 1...Nf6 (A45-A49)
• 1.d4 Nf6 2.c4 without 2...e6, 2...g6: Atypical Indian systems (A50-A79)
• 1.d4 f5: Dutch Defence (A80-A99)

Irregular openings are chess openings with an unusual first move from White. ... Moves 1. ... The Dutch Defence is a chess opening characterised by the moves 1. ...

B

• 1.e4 without 1...c5, 1...e6, 1...e5 (B00-B19)
• 1.e4 c5: sss Defence (B20-B99)

C

• 1.e4 e6: French Defence (C00-C19)
• 1.e4 e5: Double King Pawn games (C20-C99)

The French Defence. ...

D

• 1.d4 d5: Double Queen Pawn games (D00-D69)
• 1.d4 Nf6 2.c4 g6 with 3...d5: Grünfeld Defence (D70-D99)

The Grünfeld Defence (ECO codes D70-D99) is a chess opening characterised by the moves 1. ...

E

• 1.d4 Nf6 2.c4 e6: Indian systems with ...e6 (E00-E59)
• 1.d4 Nf6 2.c4 g6 without 3...d5: Indian systems with ...g6 (except Grünfeld) (E60-E99)

Moves 1. ...

See also

• Chess Informant
• List of chess openings for the full ECO codes

Chess Informant (Å ahovski Informator) is a publishing company that periodically produces a book of the same name, as well as the Encyclopaedia of Chess Openings, Encyclopaedia of Chess Endings, Opening Monographs, other print publications, and software (including electronic editions of all most print publications. ... This is a list of chess openings by the ECO classification: See also Chess and chess openings. ...

References

• Classification of Chess Openings, Chess Inforamant, 1971

External links

• Chess Archaeology
• Official website
• codes with names
• ECO codes
• publisher website