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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 | |
 [2004-01-27] 13th Japanese Ryusei, group stage
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| Nakaonoda Tomomi 9p | Oya Koichi 9p | W+R |  |
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| [2003-12-01] 29th Japanese Gosei, round 1
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| Oya Koichi 9p | O Rissei 9p | W+5.5 | |
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| [2003-07-27] 3rd Honinbo Shusaku Cup, final
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| Oya Koichi 9p | Hane Naoki 9p | B+2.5 | |
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| [2003-06-23] 12th Japanese Ryusei, round 2
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| Cho Sonjin 9p | Oya Koichi 9p | B+R | |
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| [2003-05-26] 12th Japanese Ryusei, round 1
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| Oya Koichi 9p | Kono Rin 7p | B+0.5 | |
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| [2003-04-07] 12th Japanese Ryusei, group stage
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| O Rissei 9p | Oya Koichi 9p | B+5.5 | |
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| [2003-01-20] 12th Japanese Ryusei, group stage
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| Oya Koichi 9p | Otake Hideo 9p | B+1.5 | |
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| [2003-01-20] 12th Japanese Ryusei, group stage
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| Abe Yoshiteru 9p | Oya Koichi 9p | W+R | |
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| [2002-12-09] 12th Japanese Ryusei, group stage
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| Oya Koichi 9p | Kataoka Satoshi 9p | B+R | |
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| [2002-12-09] 12th Japanese Ryusei, group stage
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| Yokota Shigeaki 9p | Oya Koichi 9p | W+R | |
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| [2002-11-07] 28th Japanese Gosei, round 1
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| Oya Koichi 9p | Kenmochi Joe 7p | W+R | |
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| [2002-04-21] 50th Japanese NHK Cup, round 1
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| Oya Koichi 9p | Chin Kaei 9p | W+2.5 | |
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| [2001-04-29] 49th Japanese NHK Cup, round 1
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| Yuki Satoshi 9p | Oya Koichi 8p | B+5.5 | |
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| [2001-04-05] 56th Japanese Honinbo, league
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| Oya Koichi 8p | Yuki Satoshi 9p | W+2.5 | |
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| [2001-03-08] 56th Japanese Honinbo, league
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| Cho Chikun 9p | Oya Koichi 8p | B+R | |
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| [2001-02-08] 56th Japanese Honinbo, league
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| Hane Naoki 8p | Oya Koichi 8p | B+0.5 | |
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| [2001-01-18] 56th Japanese Honinbo, league
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| Otake Hideo 9p | Oya Koichi 8p | W+R | |
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| [2000-12-07] 56th Japanese Honinbo, league
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| Oya Koichi 8p | Yamada Kimio 8p | B+1.5 | |
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| [2000-11-09] 56th Japanese Honinbo, league
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| Oya Koichi 8p | Cho U 6p | W+R | |
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| [2000-10-19] 56th Japanese Honinbo, league
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| Oya Koichi 8p | Cho Sonjin 9p | W+0.5 | |
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| [2000-09-18] 7th Japanese Agon Cup, semi-final
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| Oya Koichi 8p | Cho Sonjin 9p | W+2.5 | |
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| [2000-07-13] 56th Japanese Honinbo, preliminary
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| Oya Koichi 8p | Kataoka Satoshi 9p | B+2.5 | |
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| [1999-07-01] 47th Japanese Oza, round 2
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| Kato Masao 9p | Oya Koichi 8p | B+2.5 | |
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| [1999-06-20] 47th Japanese NHK Cup, round 1
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| Oya Koichi 8p | Yoshida Mika 6p | W+R | |
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| [1999-04-29] 47th Japanese Oza, round 1
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| Oya Koichi 8p | Hane Naoki 7p | B+R | |
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| [1999-02-01] 8th Japanese Ryusei, group stage
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| Tokimoto Hajime 8p | Oya Koichi 8p | B+8.5 | |
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| [1998-12-22] 8th Japanese Ryusei, group stage
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| Muramatsu Ryuichi 7p | Oya Koichi 8p | W+R | |
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| [1998-09-17] 46th Japanese Oza, challenger decision match
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| Oya Koichi 8p | O Rissei 9p | W+1.5 | |
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| [1998-08-23] 46th Japanese NHK Cup, round 2
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| Tono Hiroaki 9p | Oya Koichi 8p | B+R | |
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| [1998-08-20] 46th Japanese Oza, semi-final
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| Oya Koichi 8p | Oyama Kunio 9p | B+1.5 | |
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