Cho Chikun
The Nihon Ki-in decided to name players who had won the Hon'inbō tournament 5 times or more in a row (making them Honorary Hon'inbō) would be given the Hon'inbō prefix after Cho Chikun won the title 10 times in a row. This meant that Takagawa Kaku (9 in a row), Sakata Eio (7), Ishida Yoshio (5), and Cho Chikun (10) may be addressed as 22nd, 23rd, 24th and 25th Hon'inbō respectively whether or not they are currently holding the Hon'inbō title.