Koji Tosa
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| Koji Tosa 8-dan | |
|---|---|
| Native name | 土佐浩司 |
| Date of Birth | 30 March 1955 |
| Place of Birth | Minamiuonuma City, Niigata Prefecture |
| Teacher | Shizuo Seino 8-dan |
| Tournament | Wins |
|---|---|
| Fast Shogi Championship | 1 title (term 32) |
| Rank | Date |
|---|---|
| 6-kyu | 1971 |
| 1-dan | 1973 |
| 4-dan | 19 February 1976 |
| 5-dan | 1 April 1984 |
| 6-dan | 14 April 1989 |
| 7-dan | 25 July 1997 |
| 8-dan | 18 September 2014 |
| Retired | 14 May 2020 |