Oya Koichi
Key name (used for sorting): Oya Koichi
1966-03-22 –
Citizenship: JPN
Affiliation: Nihon Kiin
Rank progression
| 1p | 1980 |
| 2p | 1981-03-20 |
| 3p | 1982-06-18 |
| 4p | 1983-09-02 |
| 5p | 1985-05-31 |
| 6p | 1986-10-31 |
| 7p | 1990-10-19 |
| 8p | 1995-06-16 |
| 9p | 2001-06 |
ID: 434. Last changed: March 4, 2023, 8:13 p.m. by ug.
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