Shusaku Koketsu Kifu
Keywords: Books & Publications
Shusaku Koketsu Kifu (秀策口訣棋譜, 1904) is a collection of 100 openings by Ishigaya Kosaku which he claims commented by Shusaku in conversation. Can't be confirmed because the games have no player names. Available at the Japanese National Diet Library: vol.1 and
vol.2