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Encyclopedia > Encyclopedia of Chess Openings

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.


Main ECO codes


  1. R' 1. e4, 1. d4: Irregular openings.
  2. d4 R' 1 ...d5, 1... Nf6: Atypical replies to 1.d4
  3. d4 Nf6 2. R' 2. c4: Atypical replies to 1...Nf6
  4. d4 Nf6 2. c4 R' 2... e6, 2... g6: Atypical Indian systems.


  1. e4 R' 1... c5, 1... e6, 1... e5: Most Semi-Open Defences
  2. e4 c5: Sicilian Defence


  1. e4 e6: French defence
  2. e4 e5: Double King Pawn games


  1. d4 d5: Double Queen Pawn games
  2. d4 Nf6 2. c4 g6 + d7-d5: Grunfeld Defence


  1. d4 Nf6 2. c4 e6: Indian systems with ...e6
  2. d4 Nf6 2. c4 g6 ' d7-d5: Indian systems with ...g6 (except Grunfeld)

See also

  Results from FactBites:
Chess Opening Encyclopedias Software (527 words)
Comprehensive Chess Openings 2005 - this is an opening encyclopedia including detailed theoretical material in all the chess openings 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 book - Chesspedia, The Free Chess Encyclopedia Pushedpawn.org (413 words)
Opening books, which discuss chess openings, 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 Chess Openings.
The Encyclopedia of Chess Openings - This is a very technical and advanced work in 5 volumes published by Chess Informant of Belgrade.
  More results at FactBites »



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