About Sakata Eio
Sakata Eio was a 9-dan Japanese professional Go player. Sakata started out well, winning three of the first four games, but Hashimoto fought back and won the final four games, and so kept the Hon'inbō title. Afterwards, Sakata went on to win a couple of small titles which were the start of a meteoric run of major wins in which he won almost all of the titles in Japan except the Hon'inbō. His first title match was the Hon'inbō in 1951 when he challenged Hashimoto Utaro. More than usual was at stake in the match because Hashimoto played for the Kansai Ki-in, which Hashimoto had founded the year before.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.