Due to the sheer volume of theory, the latest 5th edition of Volume B is split into two parts: House of Staunton Part 1 (B00–B49):
Dedicated almost entirely to the most analyzed opening in chess history: the Sicilian Defence (main lines), including the (B70-79), and Scheveningen Chess Informant Key Features of the ECO System encyclopedia of chess openings volume b pdf
Covers the Scandinavian Defense , Alekhine's Defense , Pirc Defense , Caro-Kann Defense , and "Anti-Sicilian" systems like the Alapin ( 2.c3 ) and Closed Sicilian. Due to the sheer volume of theory, the