Games Between Two Players
Cho Chikun (5 win; 1 loss) vs. Oya Koichi
| Game Date and Game Description | |||||
| Black | White | Result | Replay | Download | |
 [2021-11-29] 48th Japanese Tengen, preliminary A
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| Oya Koichi 9p | Cho Chikun 9p | W+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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| [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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| [2005-10-20] 32nd Japanese Tengen, preliminary
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| Oya Koichi 9p | Cho Chikun 9p | W+R | |
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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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| [1992-11-12] 18th Japanese Gosei, round 2
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| Cho Chikun 9p | Oya Koichi 7p | B+R | |
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