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Games played by Oya Koichi
Total: 189; won: 74; winning percentage: 39.2%
| Game Date and Game Description | |||||
| Black | White | Result | Replay | Download | |
 [1987-03-26] 35th Japanese Oza, round 1
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| Oya Koichi 6p | Sonoda Yuichi 9p | B+3.5 |  |
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| [1986-08-17] 17th Japanese Shinei Tournament, final
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| Oya Koichi 5p | Yoda Norimoto 6p | W+R | |
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| [1986-08-10] 17th Japanese Shinei Tournament, semi-final
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| Oya Koichi 5p | Aragaki Takeshi 7p | B+T | |
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| [1986-07-24] 11th Japanese Shinjin O, semi-final
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| O Rissei 8p | Oya Koichi 5p | B+R | |
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| [1986-06-14] 2nd Japanese NEC Shunei, round 1
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| Yamada Wakio 3p | Oya Koichi 5p | B+R | |
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| [1986-05-21] 11th Japanese Kisei, 5 dan group final
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| Oya Koichi 5p | Ishikura Noboru 5p | W+2.5 | |
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| [1986-02-13] 12th Japanese Tengen, round 1
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| Oya Koichi 5p | Ishida Yoshio 9p | W+R | |
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| [1985-02-13] 41st Japanese Honinbo, preliminary
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| Hidaka Toshiyuki 4p | Oya Koichi 4p | W+R | |
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| [1984-09-01] 8th Ryuen Cup, final
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| Ogata Masaki 5p | Oya Koichi 4p | B+0.5 | |
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