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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 | |
 [2009-09-03] 35th Japanese Kisei, preliminary
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| Rin Kaiho 9p | Oya Koichi 9p | W+R |  |
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| [2009-08-20] 65th Japanese Honinbo, preliminary
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| Yuki Satoshi 9p | Oya Koichi 9p | B+R | |
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| [2009-07-23] 65th Japanese Honinbo, preliminary
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| Oya Koichi 9p | Cho Chikun 9p | B+R | |
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| [2009-06-18] 16th Japanese Agon Cup, round 1
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| Oya Koichi 9p | Ko Iso 7p | W+R | |
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| [2009-01-15] 48th Japanese Judan, preliminary
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| Takemiya Masaki 9p | Oya Koichi 9p | W+2.5 | |
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| [2008-12-18] 34th Japanese Gosei, round 1
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| O Meien 9p | Oya Koichi 9p | B+13.5 | |
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| [2008-12-11] 18th Japanese Ryusei, group stage
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| Ryu Shikun 9p | Oya Koichi 9p | B+R | |
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| [2008-11-27] 48th Japanese Judan, preliminary
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| Yoda Norimoto 9p | Oya Koichi 9p | W+0.5 | |
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| [2008-09-04] 35th Japanese Tengen, preliminary
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| Otake Hideo 9p | Oya Koichi 9p | B+R | |
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| [2008-01-10] 21st Fujitsu Cup, Japanese preliminary
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| Oya Koichi 9p | Cho Sonjin 9p | W+R | |
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| [2007-12-06] 33rd Japanese Gosei, round 1
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| Oya Koichi 9p | Takao Shinji 9p | W+R | |
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| [2007-03-15] 16th Japanese Ryusei, group stage
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| Yo Kagen 9p | Oya Koichi 9p | B+R | |
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| [2006-12-07] 33rd Japanese Tengen, round 1
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| Oya Koichi 9p | Takemiya Masaki 9p | W+R | |
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| [2006-07-03] 15th Japanese Ryusei, semi-final
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| Cho U 9p | Oya Koichi 9p | B+R | |
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| [2006-05-29] 15th Japanese Ryusei, round 2
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| Oya Koichi 9p | Yoda Norimoto 9p | B+0.5 | |
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| [2006-05-25] 3rd Toyota Cup, Japanese preliminary
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| Oya Koichi 9p | Cho Chikun 9p | W+4.5 | |
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| [2006-05-01] 15th Japanese Ryusei, round 1
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| Oya Koichi 9p | Mizokami Tomochika 8p | B+R | |
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| [2006-02-16] 62nd Japanese Honinbo, preliminary
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| Kobayashi Satoru 9p | Oya Koichi 9p | B+2.5 | |
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| [2006-02-07] 15th Japanese Ryusei, group stage
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| Oya Koichi 9p | Takao Shinji 9p | W+13.5 | |
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| [2006-01-12] 19th Fujitsu Cup, Japanese preliminary
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| Kataoka Satoshi 9p | Oya Koichi 9p | B+8.5 | |
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| [2005-12-20] 15th Japanese Ryusei, group stage
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| Oya Koichi 9p | Abe Yoshiteru 9p | B+R | |
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| [2005-12-20] 15th Japanese Ryusei, group stage
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| Oya Koichi 9p | Hashimoto Yujiro 9p | B+3.5 | |
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| [2005-12-05] 15th Japanese Ryusei, group stage
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| Oya Koichi 9p | Yamada Kimio 8p | B+R | |
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| [2005-10-20] 32nd Japanese Tengen, preliminary
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| Oya Koichi 9p | Cho Chikun 9p | W+R | |
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| [2005-01-18] 14th Japanese Ryusei, group stage
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| Aragaki Takeshi 9p | Oya Koichi 9p | W+R | |
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| [2005-01-06] 31st Japanese Tengen, round 1
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| Oya Koichi 9p | Yokota Shigeaki 9p | W+R | |
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| [2004-12-20] 14th Japanese Ryusei, group stage
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| Ryu Shikun 9p | Oya Koichi 9p | W+4.5 | |
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| [2004-07-15] 11th Japanese Agon Cup, round 1
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| Oya Koichi 9p | O Rissei 9p | W+1.5 | |
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| [2004-06-10] 60th Japanese Honinbo, preliminary
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| Ohba Junya 2p | Oya Koichi 9p | B+4.5 | |
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| [2004-03-02] 13th Japanese Ryusei, group stage
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| Kamimura Haruo 9p | Oya Koichi 9p | B+R | |
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