Encyclopaedia of Chess Opening B2 (5th edition)Encyclopaedia of Chess Openings Volume B Part II Half a century ago the first edition of the Encyclopaedia of Chess Openings was released, as a truly unique, ground breaking tome. Such monumental work was a logical continuation to the Informant series which came to life a few years earlier. Chess Informant introduced a completely revolutionary system of chess signs, and also created the classification of chess openings, according to codes (ECO codes).