Honinbo Sanseki
Honinbo Sanseki (本因坊算碩) was a Jozu (professional 7-dan), and heir & pupil to Honinbo Sansa, however he died prematurely.[1] No records of his games were left.
Debate exists as to whether Sanseki had been attributed the surname Honinbo, because of a lack of stipend found, which would have normally been given to those acquiring the surname.
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Notes
[1] Kido Yearbook 1995, pp. 402.