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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 | |
 [2017-06-22] 66th Japanese Oza, preliminary
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| Oya Koichi 9p | Kataoka Satoshi 9p | W+5.5 |  |
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| [2016-12-15] 43rd Japanese Tengen, round 1
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| Ko Iso 8p | Oya Koichi 9p | B+R | |
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| [2016-10-20] 43rd Japanese Tengen, preliminary
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| Ishida Yoshio 9p | Oya Koichi 9p | W+R | |
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| [2015-12-24] 25th Japanese Ryusei, group A
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| Yukawa Mitsuhisa 9p | Oya Koichi 9p | B+R | |
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| [2015-11-26] 41st Japanese Kisei, preliminary
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| Oya Koichi 9p | Ishida Yoshio 9p | W+R | |
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| [2015-11-07] 2nd Japanese OVER40 Hayago Tournament, semi-final
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| O Meien 9p | Oya Koichi 9p | B+R | |
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| [2015-10-08] 42nd Japanese Tengen, preliminary
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| Kobayashi Satoru 9p | Oya Koichi 9p | W+R | |
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| [2015-01-26] 24th Japanese Ryusei, group stage
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| Oya Koichi 9p | Hong Seokui 7d | W+R | |
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| [2014-04-10] 70th Japanese Honinbo, preliminary
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| Oya Koichi 9p | Ishida Yoshio 9p | B+R | |
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| [2014-03-27] 23rd Japanese Ryusei, group stage
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| Oya Koichi 9p | Otake Hideo 9p | W+R | |
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| [2014-02-06] 23rd Japanese Ryusei, group stage
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| Oya Koichi 9p | Hsu Chiayuan 1p | B+R | |
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| [2013-12-12] 62nd Japanese Oza, preliminary
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| Ishida Yoshio 9p | Oya Koichi 9p | B+R | |
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| [2013-11-28] 40th Japanese Tengen, preliminary
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| Ichiriki Ryo 3p | Oya Koichi 9p | B+R | |
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| [2013-02-07] 39th Japanese Tengen, round 1
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| Oya Koichi 9p | So Yokoku 8p | W+1.5 | |
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| [2013-01-19] 8th Japanese Daiwa-Shoken Cup, round 3
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| Oya Koichi 9p | Yuki Satoshi 9p | W+10.5 | |
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| [2013-01-17] 39th Japanese Tengen
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| Shuto Shun 7p | Oya Koichi 9p | W+R | |
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| [2012-12-15] 8th Japanese Daiwa-Shoken Cup, round 2
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| Oya Koichi 9p | Tsuruyama Atsushi 7p | B+7.5 | |
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| [2012-11-17] 8th Japanese Daiwa-Shoken Cup, round 1
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| Yamashita Keigo 9p | Oya Koichi 9p | W+R | |
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| [2012-11-08] 39th Japanese Tengen, preliminary
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| Oya Koichi 9p | Kobayashi Satoru 9p | B+R | |
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| [2012-04-19] 17th LG Cup, preliminary
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| Oya Koichi 9p | Hwang Jinhyung 1p | W+R | |
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| [2012-01-12] 21st Japanese Ryusei, group stage
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| Oya Koichi 9p | Nishimura Keiji 8p | B+R | |
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| [2012-01-12] 21st Japanese Ryusei, group stage
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| Yoda Norimoto 9p | Oya Koichi 9p | B+R | |
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| [2011-12-03] 7th Japanese Daiwa-Shoken Cup, round 2
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| Takao Shinji 9p | Oya Koichi 9p | B+R | |
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| [2011-11-17] 38th Japanese Tengen, preliminary
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| Oya Koichi 9p | Takao Shinji 9p | W+R | |
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| [2011-09-10] 7th Japanese Daiwa-Shoken Cup, round 1
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| Oya Koichi 9p | Ogaki Yusaku 9p | B+0.5 | |
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| [2011-04-29] 16th LG Cup, preliminary
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| Lee Changho 9p | Oya Koichi 9p | B+R | |
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| [2011-03-31] 67th Japanese Honinbo, preliminary
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| So Yokoku 8p | Oya Koichi 9p | B+R | |
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| [2011-01-13] 20th Japanese Ryusei, group stage
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| Oya Koichi 9p | Mitani Tetsuya 6p | W+R | |
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| [2010-05-13] 49th Japanese Judan, preliminary
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| Kono Rin 9p | Oya Koichi 9p | B+2.5 | |
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| [2009-11-30] 19th Japanese Ryusei, group stage
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| Kato Atsushi 8p | Oya Koichi 9p | B+R | |
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