The is the definitive reference for "Semi-Open Games" starting with 1.e4 , specifically those that are not the French Defence. Published by Chess Informant (Šahovski informator) , it uses a standardized system of symbols and codes (B00–B99) instead of text to provide universal analysis. Volume B is typically split into two parts: Volume B: Part 1 (Codes B00–B49)
Dedicated entirely to the main lines of the Sicilian Defense, including the Richter-Rauzer, Dragon, Scheveningen, and the legendary Najdorf Variation. Amazon.com Key Openings by ECO Code encyclopedia of chess openings volume b pdf
Once you study a specific branch of Volume B (for example, the Richter-Rauzer Sicilian), go online and play several rapid or blitz games utilizing that exact setup to cement the tactical patterns in your brain. Encyclopedia of Chess Openings (ECO) Volume B The