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ECO - Encyclopedia of Chess Openings

ECO code is a trademark of Chess Informant.

A library of five volumes (A, B, C, D, E - referring to the five main groups of the classification of openings, provides readers a comprehensive collection of modern opening theory. On over 3000 pages, the examples from over 150 000 games and analyses are included. Contributors and authors of this important working tool are superclass chess players from all over the world. 

A English Opening, Reti, Benoni, Volga Gambit, Dutch Defense, ...  
B Sicilian Defense, Caro-Kann, Pirc, Modern, Alekhine, Scandinavian, ... 
C  Ruy Lopez, French, Scotch, Russian, King’s Gambit, ... 
D Queen’s Gambit, Slav, Gruenfeld, Queen's Pawn Game, ...
E  King’s Indian, Nimzo-Indian, Queen’s Indian, Bogolubov, Catalan, ...