Games Between Two Players
Kobayashi Koichi (2 win; 1 loss) vs. Sonoda Yasutaka
| Game Date and Game Description | |||||
| Black | White | Result | Replay | Download | |
 [2022-01-20] 1st Japanese Teikei Cup Legend Tournament, round 2
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| Sonoda Yasutaka 9p | Kobayashi Koichi 9p | W+R |  |
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| [2021-05-13] 47th Japanese Gosei, preliminary
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| Sonoda Yasutaka 9p | Kobayashi Koichi 9p | B+R | |
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| [1994-07-21] 50th Japanese Honinbo, preliminary
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| Sonoda Yasutaka 8p | Kobayashi Koichi 9p | W+R | |
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