There are five main categories, "A" to "E", corresponding to the five volumes of the earlier editions, each of which is further subdivided into 100 subcategories, for a total of 500 codes. Instead of the traditional names for the openings, ECO has developed a coding system that has also been adopted by other chess publications. Chess Informant pioneered the use of Figurine Algebraic Notation to avoid the use of initials for the names of the pieces, which vary between languages. The bulk of the content consists of diagrams of positions and chess moves, annotated with symbols, many of them developed by Chess Informant. The books are intended for an international audience and contain only a small amount of text, which is in several languages. ECO covers the openings in more detail than rival single volume publications such as Modern Chess Openings and Nunn's Chess Openings, but in less detail than specialized opening books. The openings are provided in an ECO table that concisely presents the opening lines considered most critical by the editors. The chief editor since the first edition has been Aleksandar Matanović. The moves are taken from thousands of master games and from published analysis in Informant and compiled by the editors, most of whom are grandmasters, who select the lines which they consider most relevant or critical. Both ECO and Chess Informant are published by the Belgrade-based company Šahovski Informator.
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