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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 | |
 [2026-03-30] 53rd Japanese Tengen, preliminary C
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| Toyoda Hirohito 3p | Oya Koichi 9p | B+R |  |
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| [2026-02-12] 65th Japanese Judan, preliminary C
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| Oya Koichi 9p | Jo Bunen 2p | W+4.5 | |
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| [2025-01-30] 51st Japanese Gosei, preliminary C
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| Oya Koichi 9p | Yoda Norimoto 9p | W+R | |
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| [2025-01-20] 50th Japanese Kisei, preliminary
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| Kobayashi Izumi 7p | Oya Koichi 9p | B+6.5 | |
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| [2024-08-22] 51st Japanese Tengen, preliminary B
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| Oya Koichi 9p | Nyu Eiko 4p | B+R | |
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| [2023-08-21] 6th Japanese SGW Cup, preliminary
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| Kono Takashi 8p | Oya Koichi 9p | B+11.5 | |
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| [2023-07-13] 62nd Japanese Judan, preliminary A
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| Oya Koichi 9p | Cho U 9p | W+R | |
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| [2022-12-12] 48th Japanese Kisei, preliminary
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| Oya Koichi 9p | Osuka Seira 1p | B+6.5 | |
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| [2022-08-22] 5th Japanese SGW Cup, preliminary
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| Oya Koichi 9p | Xie Yimin 7p | W+R | |
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| [2021-11-29] 48th Japanese Tengen, preliminary A
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| Oya Koichi 9p | Cho Chikun 9p | W+R | |
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| [2021-08-30] 4th Japanese SGW Cup, preliminary
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| Oya Koichi 9p | Kurotaki Masaki 6p | W+R | |
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| [2021-08-30] 4th Japanese SGW Cup, preliminary
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| Okada Yumiko 6p | Oya Koichi 9p | W+R | |
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| [2021-08-30] 4th Japanese SGW Cup, preliminary
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| Takemiya Youkou 6p | Oya Koichi 9p | W+R | |
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| [2021-04-01] 60th Japanese Judan, preliminary
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| Oya Koichi 9p | Ishida Yoshio 9p | W+R | |
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| [2020-12-24] 69th Japanese Oza, preliminary
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| Motoki Katsuya 8p | Oya Koichi 9p | B+R | |
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| [2020-12-21] 77th Japanese Honinbo, preliminary
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| Oya Koichi 9p | Yoda Norimoto 9p | B+8.5 | |
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| [2020-11-09] 47th Japanese Tengen, preliminary
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| Oya Koichi 9p | Hsu Chiayuan 8p | W+R | |
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| [2020-11-01] 3rd Japanese SGW Cup, round 3
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| Oya Koichi 9p | Mochizuki Kenichi 8p | W+R | |
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| [2020-11-01] 3rd Japanese SGW Cup, round 4
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| Oya Koichi 9p | Yamamoto Kentaro 5p | W+R | |
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| [2020-10-31] 3rd Japanese SGW Cup, round 2
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| Oya Koichi 9p | Omori Yasushi 9p | B+2.5 | |
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| [2020-10-31] 3rd Japanese SGW Cup, round 1
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| Oya Koichi 9p | Ogata Masaki 9p | W+R | |
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| [2020-08-24] 3rd Japanese SGW Cup, preliminary
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| Nakazawa Ayako 5p | Oya Koichi 9p | W+15.5 | |
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| [2020-08-24] 3rd Japanese SGW Cup, preliminary
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| Anzai Nobuaki 7p | Oya Koichi 9p | W+4.5 | |
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| [2019-12-12] 46th Japanese Meijin, preliminary
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| Ueno Risa 1p | Oya Koichi 9p | W+1.5 | |
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| [2019-10-24] 59th Japanese Judan, preliminary
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| Xie Yimin 6p | Oya Koichi 9p | B+R | |
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| [2019-09-16] 2nd Japanese SGW Cup, preliminary
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| Oya Koichi 9p | Iguchi Toyohide 8p | W+R | |
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| [2019-09-12] 46th Japanese Tengen, preliminary
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| Seki Kotaro 2p | Oya Koichi 9p | B+R | |
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| [2018-11-20] 1st Japanese SGW Cup, preliminary
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| Oya Koichi 9p | Ohashi Hirofumi 6p | W+R | |
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| [2017-12-21] 27th Japanese Ryusei, group A
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| Oya Koichi 9p | Imamura Toshiya 9p | W+R | |
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| [2017-08-01] Japanese National Squad AI Training
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| Oya Koichi 9p | DeepZenGo NR | W+R | |
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