Hon'inbō; Honinbo; grandmaster
A prestigious title in professional Go, originally the name of a historical Go house. Also used to refer to the holder of the title. The cross-reference to 本因坊戦 indicates the tournament context.
See also: 本因坊戦
He won the Hon'inbō title three times in a row.
The Hon'inbō tournament is one of the major Japanese Go title matches.