Found this today, and since we also have Castle Games here, some might be interested to read some background information.
Castle Games of the Edo Period – The Ôhashi records
AN EYE-WITNESS REPORT DISCOVERED BY MASUKAWA KÔICHI
I’ll quote just the first paragraph:
[quote]Starting in June 1995, I have examined fragmentary scriptures from the traditional Shogi player family Ôhashi and was able to discover some twenty five hitherto unknown texts that deal in official manner with the annual tournaments of Go and Shogi at Edo Castle. The author of all these fragmentary records is the fifth head of the house of Ôhashi, called Ôhashi Sôkei the third. The records cover the thirty four years from 1674 to 1708. Here I would like to present the first record.