Games Between Two Players
Kobayashi Koichi (8 win; 3 loss) vs. Sakai Takeshi
| Game Date and Game Description | |||||
| Black | White | Result | Replay | Download | |
 [2019-11-14] 45th Japanese Kisei, preliminary
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| Sakai Takeshi 9p | Kobayashi Koichi 9p | W+R |  |
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| [2010-11-25] 59th Japanese Oza, preliminary
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| Kobayashi Koichi 9p | Sakai Takeshi 9p | W+5.5 | |
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| [2007-04-19] 46th Japanese Judan, preliminary
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| Sakai Takeshi 9p | Kobayashi Koichi 9p | W+R | |
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| [2006-07-13] 45th Japanese Judan, loser section round 1
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| Sakai Takeshi 9p | Kobayashi Koichi 9p | W+R | |
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| [1990-04-19] 16th Japanese Tengen, round 2
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| Sakai Takeshi 9p | Kobayashi Koichi 9p | W+4.5 | |
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| [1988-05-19] 36th Japanese Oza, round 1
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| Kobayashi Koichi 9p | Sakai Takeshi 9p | B+R | |
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| [1979-06-14] 4th Japanese Kisei, 8 dan group final
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| Kobayashi Koichi 8p | Sakai Takeshi 8p | W+0.5 | |
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| [1979-01-11] 34th Japanese Honinbo, league
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| Kobayashi Koichi 8p | Sakai Takeshi 8p | B+R | |
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| [1975-08-28] 23rd Japanese Oza, round 2
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| Kobayashi Koichi 7p | Sakai Takeshi 7p | W+7.5 | |
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| [1974-09-12] 18th Japanese Prime Minister's Cup, semi-final
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| Sakai Takeshi 7p | Kobayashi Koichi 6p | W+1.5 | |
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| [1973-05-06] 17th Japanese Prime Minister's Cup, round 2
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| Sakai Takeshi 6p | Kobayashi Koichi 6p | W+R | |
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