Games Between Two Players
Kobayashi Koichi (6 win; 1 loss) vs. Cho Sonjin
| Game Date and Game Description | |||||
| Black | White | Result | Replay | Download | |
 [2008-06-21] 4th Japanese Daiwa-Shoken Cup, round 1
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| Kobayashi Koichi 9p | Cho Sonjin 9p | B+R |  |
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| [2006-11-23] 20th Fujitsu Cup, Japanese preliminary
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| Cho Sonjin 9p | Kobayashi Koichi 9p | B+R | |
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| [2003-11-06] 59th Japanese Honinbo, league
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| Kobayashi Koichi 9p | Cho Sonjin 9p | B+R | |
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| [2002-11-14] 58th Japanese Honinbo, league
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| Kobayashi Koichi 9p | Cho Sonjin 9p | B+3.5 | |
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| [2001-09-02] 34th Japanese Hayago Championship, semi-final
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| Cho Sonjin 9p | Kobayashi Koichi 9p | W+R | |
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| [1999-09-18] 19th Japanese NEC Cup, round 2
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| Cho Sonjin 9p | Kobayashi Koichi 9p | W+R | |
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| [1997-04-28] 6th Japanese Ryusei, round 1
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| Kobayashi Koichi 9p | Cho Sonjin 8p | B+11.5 | |
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