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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 | |
 [1998-07-23] 46th Japanese Oza, round 2
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| Oya Koichi 8p | Kato Masao 9p | B+R |  |
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| [1998-04-30] 23rd Japanese Kisei, 8 dan group final
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| Hiroe Hiroyuki 8p | Oya Koichi 8p | B+1.5 | |
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| [1998-04-12] 46th Japanese NHK Cup, round 1
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| Kurahashi Masayuki 8p | Oya Koichi 8p | W+4.5 | |
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| [1998-04-02] 46th Japanese Oza, round 1
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| Oya Koichi 8p | Yuki Satoshi 9p | B+R | |
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| [1997-08-07] 53rd Japanese Honinbo, preliminary
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| Oya Koichi 8p | O Meien 9p | W+R | |
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| [1997-03-06] 22nd Japanese Gosei, round 2
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| Oya Koichi 8p | Iwata Tatsuaki 9p | W+R | |
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| [1997-02-17] 6th Japanese Ryusei, group stage
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| Hisajima Kunio 9p | Oya Koichi 8p | B+8.5 | |
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| [1997-01-16] 22nd Japanese Gosei, round 1
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| Oya Koichi 8p | Kojima Takaho 9p | B+R | |
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| [1996-12-16] 6th Japanese Ryusei, group stage
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| Tei Meiko 9p | Oya Koichi 8p | W+R | |
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| [1996-12-16] 6th Japanese Ryusei, group stage
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| Oya Koichi 8p | Nakano Hironari 8p | B+R | |
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| [1995-03-09] 20th Japanese Gosei, round 2
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| Ushinohama Satsuo 9p | Oya Koichi 7p | B+2.5 | |
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| [1995-02-09] 21st Japanese Tengen
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| Oya Koichi 7p | Nakamura Hidehito 9p | W+R | |
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| [1994-11-24] 20th Japanese Shinjin O, round 1
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| Oya Koichi 7p | Kurahashi Masayuki 6p | W+R | |
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| [1994-11-10] 20th Japanese Gosei, round 1
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| Kishimoto Kazuo 9p | Oya Koichi 7p | W+1.5 | |
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| [1994-08-11] 19th Japanese Shinjin O, semi-final
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| Mimura Tomoyasu 7p | Oya Koichi 7p | B+R | |
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| [1994-04-14] 19th Japanese Gosei, round 3
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| Oya Koichi 7p | Rin Kaiho 9p | W+R | |
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| [1994-03-17] 19th Japanese Gosei, round 2
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| Yamada Kimio 6p | Oya Koichi 7p | W+12.5 | |
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| [1994-02-17] 42nd Japanese Oza, preliminary
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| Oya Koichi 7p | Kataoka Satoshi 9p | W+R | |
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| [1994-01-27] 19th Japanese Gosei, round 1
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| Kataoka Satoshi 9p | Oya Koichi 7p | W+4.5 | |
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| [1993-12-13] 4th Japanese Ryusei, group stage
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| Oya Koichi 7p | Nakano Hironari 7p | W+R | |
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| [1993-10-02] 13th Japanese NEC Cup, round 2
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| Komatsu Hideki 8p | Oya Koichi 7p | B+9.5 | |
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| [1993-07-01] 18th Japanese Shinjin O, semi-final
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| Yuki Satoshi 8p | Oya Koichi 7p | B+R | |
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| [1993-04-29] 18th Japanese Shinjin O, round 3
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| Oya Koichi 7p | Ryu Shikun 5p | B+2.5 | |
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| [1993-03-13] 8th Japanese NEC Shunei, final
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| Oya Koichi 7p | Ryu Shikun 5p | B+R | |
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| [1993-03-11] 32nd Japanese Judan, preliminary
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| Kobayashi Satoru 9p | Oya Koichi 7p | B+R | |
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| [1992-11-12] 18th Japanese Gosei, round 2
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| Cho Chikun 9p | Oya Koichi 7p | B+R | |
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| [1992-11-02] 3rd Japanese Ryusei, group stage
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| Oya Koichi 7p | Nakaonoda Tomomi 6p | W+R | |
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| [1992-10-17] 23rd Japanese Shinei Tournament, round 1
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| Michael Redmond 7p | Oya Koichi 7p | W+R | |
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| [1992-10-15] 18th Japanese Gosei, round 1
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| Oya Koichi 7p | Cho Sonjin 7p | B+8.5 | |
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| [1992-07-30] 31st Japanese Judan, loser section round 1
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| Sakata Eio 9p | Oya Koichi 7p | B+R | |
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