Kogishi Soji (小岸壮二, 3 January 1898 - 7 January 1924) was a pupil and intended heir of Honinbo Shusai. He died of typhoid at the age of 26 just after achieving the rank of 6-dan.
At the age of nine Kogishi was accepted into Honinbo Shusai's school. Eight years later he became a 1-dan. This was due to Shusai's stringent requirements for reaching professional rank. However, once attained he rose quickly through the ranks, racking up an astonishing number of wins. In 1917, he became 3-dan winning 15 out of his 16 matches. In 1918, won 41, lost 9, and had 4-jigos. The next year, in 1919, he was promoted to 4-dan with 34-wins and 4-losses. In 1921, he was promoted to 5-dan; and to 6-dan in 1924, just before his death. During his last three years he attained a 90% winning average, and earned an outstanding record of defeating 32 famed players successively.
Kogishi's progress resonated well with his teacher, Shusai. As such, Shusai had plans for his pupil to become heir as Honinbo XXII, Shuritsu. However, immediately after Kogishi's promotion to 6-dan he became stricken with typhoid and died soon thereafter.
One of Kogishi's rivals was Onoda Chiyotaro (two years his senior) of the opposing Hoensha school. Although Kogishi would usually best Onoda, their games would still gain the attention of those present. They were involved in one jubango, in which Kogishi beat down Onoda.
- 1-dan: 1915
- 3-dan: 1917
- 4-dan: 1919
- 5-dan: 1921
- 6-dan: 1924
- History and game commentary in Go Review 1970 Iss. 12.