The Encyclopedia of Chess Openings (ECO) is a 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 sahovski (http://www.sahovski.com/).
Instead of the traditional names for the openings, ECO has developed a unique coding system that has also been used by other chess publications. There are five main categories, A-E, each of which is divided into a hundred sub-categories.
Comprehensive ChessOpenings 2005 - this is an openingencyclopedia including detailed theoretical material in all the chessopenings on January 1, 2005.
Chess material is supplied by the prominent coach GM Alexander Kalinin.
This is a unique set of programs produced on 4 CDs, where four chess programs on the middlegame are put together (Encyclopedia of the Middlegame I, Encyclopedia of the MiddlegameII, Encyclopedia of the Middlegame III and Encyclopedia of the Middlegame IV), covering the theory and practice of the middlegame for each of the openings.
Opening books, which discuss chessopenings, are by far the most common type of literature on Chess play.
Manuals giving general opening advice and guidance - Possibly the most famous example of this type of manual (in English) is Reuben Fine's The Ideas Behind the ChessOpenings.
The Encyclopedia of ChessOpenings - This is a very technical and advanced work in 5 volumes published by Chess Informant of Belgrade.