Kaku Takagawa

This could be seen as Sakata would constantly beat Takagawa from 1959 to 1966 in the finals of major tournaments.

Takagawa's books, translated from their original Japanese, were instrumental in educating Westerners in the ways of Go.

He also wrote a series of articles from 1961 through 1977 for the Nihon Ki-in which was the primary English source of information about Go during that period.

These articles were later compiled into Improve Your Intuition, still considered a valuable guide for Go players.

He included him in his book Killer Of Go, saying he'd drag out his games so they'd be longer and then his opponent would lose their edge.