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Games played by Oya Koichi
Total: 189; won: 74; winning percentage: 39.2%
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| Black | White | Result | Replay | Download | |
 [1992-05-21] 31st Japanese Judan, winner section round 1
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| O Rissei 9p | Oya Koichi 7p | B+R |  |
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| [1992-03-25] 17th Japanese Kisei, 7 dan group
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| Yuki Satoshi 7p | Oya Koichi 7p | B+R | |
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| [1992-03-22] 22nd Japanese Shinei Tournament, final
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| Cho Sonjin 6p | Oya Koichi 7p | B+1.5 | |
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| [1992-03-08] 22nd Japanese Shinei Tournament, semi-final
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| Aoki Shinichi 7p | Oya Koichi 7p | W+1.5 | |
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| [1991-12-16] 2nd Japanese Ryusei, group stage
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| Iwata Hajime 7p | Oya Koichi 7p | B+R | |
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| [1991-11-25] 2nd Japanese Ryusei, group stage
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| Imamura Yoshiaki 7p | Oya Koichi 7p | W+6.5 | |
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| [1991-11-07] 30th Japanese Judan, loser section round 3
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| Oya Koichi 7p | Kobayashi Koichi 9p | W+R | |
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| [1991-10-24] 17th Japanese Gosei, round 1
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| Oya Koichi 7p | Shiraishi Yutaka 9p | W+1.5 | |
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| [1991-09-26] 30th Japanese Judan, loser section round 2
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| Oya Koichi 7p | Honda Kunihisa 9p | B+R | |
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| [1991-08-22] 30th Japanese Judan, loser section round 1
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| Yamada Wakio 6p | Oya Koichi 7p | W+R | |
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| [1991-06-20] 30th Japanese Judan, winner section round 1
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| Oya Koichi 7p | Yoda Norimoto 8p | W+R | |
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| [1991-05-16] 30th Japanese Judan, preliminary
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| Oya Koichi 7p | Kanashima Tadashi 9p | B+2.5 | |
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| [1990-10-15] 1st Japanese Ryusei, group stage
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| Oya Koichi 6p | Aoki Shinichi 6p | W+R | |
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| [1990-04-30] Year 1990 China-Japan Go Exchange, round 7
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| Oya Koichi 6p | Yang Hui 7p | B+1.5 | |
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| [1990-04-29] Year 1990 China-Japan Go Exchange, round 6
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| Oya Koichi 6p | Liao Guiyong 7p | W+0.5 | |
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| [1990-04-28] Year 1990 China-Japan Go Exchange, round 5
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| Liao Guiyong 7p | Oya Koichi 6p | B+R | |
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| [1989-02-26] 36th Japanese NHK Cup, round 4
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| Kobayashi Satoru 9p | Oya Koichi 6p | B+3.5 | |
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| [1989-01-29] 36th Japanese NHK Cup, round 3
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| Fujisawa Hideyuki 9p | Oya Koichi 6p | W+8.5 | |
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| [1988-10-23] 36th Japanese NHK Cup, round 2
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| Shiraishi Yutaka 9p | Oya Koichi 6p | W+R | |
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| [1988-08-06] 4th Japanese NEC Shunei, round 1
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| Oya Koichi 6p | Hidaka Toshiyuki 6p | W+R | |
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| [1988-04-17] 36th Japanese NHK Cup, round 1
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| Oya Koichi 6p | Nakamura Hidehito 9p | B+R | |
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| [1987-11-12] 27th Japanese Judan, preliminary
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| Fujisawa Hideyuki 9p | Oya Koichi 6p | W+R | |
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| [1987-06-25] 35th Japanese Oza, round 2
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| Oya Koichi 6p | Rin Kaiho 9p | W+4.5 | |
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| [1987-06-03] Year 1987 China-Japan Go Exchange, round 7
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| Oya Koichi 6p | Yang Hui 7p | B+1.5 | |
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| [1987-05-31] Year 1987 China-Japan Go Exchange, round 6
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| Oya Koichi 6p | Yu Bin 6p | W+0.5 | |
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| [1987-05-28] Year 1987 China-Japan Go Exchange, round 5
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| Yu Bin 6p | Oya Koichi 6p | B+1.5 | |
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| [1987-05-26] Year 1987 China-Japan Go Exchange, round 4
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| Liang Weitang 7p | Oya Koichi 6p | W+R | |
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| [1987-05-24] Year 1987 China-Japan Go Exchange, round 3
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| Oya Koichi 6p | Wang Jianhong 7p | B+R | |
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| [1987-05-22] Year 1987 China-Japan Go Exchange, round 2
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| Zhang Wendong 5p | Oya Koichi 6p | W+R | |
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| [1987-05-20] Year 1987 China-Japan Go Exchange, round 1
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| Oya Koichi 6p | Zhang Wendong 5p | B+R | |
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