The open ruy lopez was a career favorite of Viktor Korchnoi, who played it consistently and with success against top flight opposition. The game could not be more different from the closed, maneuvering ruy lopez of the chigorin, breyer or zaitsev variations. In the open, black places his knight centrally and looks for active piece placement to immediately apply pressure on the white camp.
The Bulgarian chess publisher “Chess Stars” has put out some fantastic literature. Their opening series according to Anand/Kramnik are well known and sought after, and their book entitled “getting an edge against the grunfeld” is one of the most in depth and impressive high level books I own. Unfortunately, there are a few of their books that are so rare and hard to find that they practically don’t exist. “Challenging the Sicilian with 2.a3!?,” by Alexei Bezgodov is one of them.