Quote:
wiki: Dōsaku was the fourth Hon'inbō, fourth Meijin and a go saint (Kisei) by the time he was 23.
The player here is not Yusui Sanchi (no such name exists in go), the game was actually on 5 January 1684 and it looks like the wiki could do with a spring clean. Dosaku was 33 when he became Meijin-Godokoro (born 1645, accepted as MG 1678), and the appellation as Gosei was made by later generations.
But it's topical in that the WAGC is being held in his home area. The Yamasaki family from which he comes still seems to be prominent and it looks like the WAGC players will be getting some sort of tour of "Dosaku Country". The board and stones he first played with have been preserved.
BTW the Castle Game above is the one that started the tradition of losing a 2-stone game by 1 points as one's "masterpiece".