Honinbo Shuei has long been esteemed by other professionals, even outside Japan.
But who was Honinbo Shuei?
Phrases such as the 'Meijin of Meijins' are bandied about.
Takagawa Kaku even took up a professional career on the strength of having acquired a set of his collected games.
Yet it has never been quite to clear to amateurs why he is so highly regarded...