In 1630, after the second meijin Doseki NAKAMURA died, in order to determine the successor, Sanchi played with Sanetsu HONINBO rokubango (six-game go match) as oshirogo (game played in the presence of the shogun in the castle during the Edo period) from 1645.
寛永3年(1630年)に2世名人中村道碩が死去した後、後継者を決めるため、正保2年(1645年)から本因坊算悦との間での争碁として互先による六番碁を御城碁にて行う。