Encyclopaedia of Chess Openings

If u playing chess for a long time, u should know ECO or Encyclopaedia of Chess Openings. I only know it yesterday. Hehehehe. Thanks Aamaludin for helping me. So what is ECO?. From wikipedia i found that:

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. These openings are typically provided in an ECO table that concisely presents the best opening lines.
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. -wikipedia


Volume A: English, Benoni, Dutch, Réti, Benko Gambit, Old Indian, Bird, etc
Volume B: Sicilian, Caro-Kann, Pirc, Alekhine, Scandinavian, etc
Volume C: Ruy Lopez, French, Petroff, King's Gambit, Philidor, Italian (Giuoco Piano and Two Knights Defense), Scotch Game, etc
Volume D: Queen's Gambit (Slav, Accepted, Orthodox, Tarrasch, Tartakower, etc), Grünfeld Defense, Queens Pawn, etc
Volume E: Nimzo-Indian, Queen's Indian, King's Indian, Catalan, Bogo-Indian, etc

See list of chess openings for full details.

First edition
The first edition was published in the following years:
volume A: 1979
volume B: 1975
volume C: 1974
volume D: 1976
volume E: 1978

Second edition
The second edition was published in the following years:
volume A:
volume B: 1984
volume C:
volume D:
volume E: