Games Between Two Players
Kobayashi Koichi (6 win; 3 loss) vs. Sonoda Yuichi
| Game Date and Game Description | |||||
| Black | White | Result | Replay | Download | |
 [2007-09-27] 33rd Japanese Meijin, preliminary
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| Sonoda Yuichi 9p | Kobayashi Koichi 9p | B+R |  |
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| [1998-03-26] 23rd Japanese Gosei, round 3
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| Sonoda Yuichi 9p | Kobayashi Koichi 9p | B+2.5 | |
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| [1995-08-10] 43rd Japanese Oza, semi-final
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| Sonoda Yuichi 9p | Kobayashi Koichi 9p | W+1.5 | |
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| [1990-10-11] 16th Japanese Tengen, challenger decision match
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| Kobayashi Koichi 9p | Sonoda Yuichi 9p | B+R | |
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| [1986-12-16] 12th Japanese Tengen, title match #4
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| Sonoda Yuichi 9p | Kobayashi Koichi 9p | W+R | |
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| [1986-12-03] 12th Japanese Tengen, title match #3
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| Kobayashi Koichi 9p | Sonoda Yuichi 9p | B+R | |
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| [1986-11-28] 12th Japanese Tengen, title match #2
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| Sonoda Yuichi 9p | Kobayashi Koichi 9p | W+3.5 | |
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| [1986-11-13] 12th Japanese Tengen, title match #1
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| Kobayashi Koichi 9p | Sonoda Yuichi 9p | W+R | |
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| [1984-10-18] 9th Japanese Kisei, round 2
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| Kobayashi Koichi 9p | Sonoda Yuichi 9p | B+R | |
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