Kashio Rigen
Kashio Rigen (1565-?) was one or more go players, one of which was the teacher of Monnyusai.
Honinbo Sansa & Kashio Rigen
For many years it was believed that Honinbo Sansa had a rivalry with a person named Kashio Rigen. However, evidence referred by Fairbairn & Hall (2009, p. 198-9) suggests that in all probability the name Kashio Rigen was a confusion based upon another text, where the two names Kashio and Rigen are immediately next to each other.[1] This would mean that Kashio and Rigen are different people and Honinbo Sansa had a rivaly with two individuals, rather than a single person.
Notes
- In a Hikaru no Go chapter, Hikaru Shindo (the protagonist) stars as Rigen in a school play.
References
[1] Fairbairn, J. & Hall, T. M. (2009). The Go companion: Go in history and culture. Richmond, VA: Slate & Shell.