The post you're likely looking for refers to a popular chess opening course by GM Michael Roiz released through Modern Chess in 2019 .
Focuses specifically on the main line Breyer structures and tactical subtleties. Complete Spanish Repertoire For Black The Bre...
It is designed for players who enjoy "slow, maneuvering positions" and deep theoretical understanding rather than immediate sharp tactical clashes. The post you're likely looking for refers to
Covers all other variations White might play against the Spanish (Ruy Lopez) that aren't the Breyer. Complete Spanish Repertoire For Black The Bre...
GM Michael Roiz, a renowned theoretician known for his work in the "Grandmaster Repertoire" series. Content: The repertoire is split into two parts: