Covers all other variations White might play against the Spanish (Ruy Lopez) that aren't the Breyer.
The post you're likely looking for refers to a popular chess opening course by GM Michael Roiz released through Modern Chess in 2019 . 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: Covers all other variations White might play against