Games Between Two Players
Kobayashi Koichi (7 win; 0 loss) vs. Iwata Tatsuaki
| Game Date and Game Description | |||||
| Black | White | Result | Replay | Download | |
 [1987-05-14] 35th Japanese Oza, round 1
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| Iwata Tatsuaki 9p | Kobayashi Koichi 9p | W+4.5 |  |
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| [1984-10-25] 40th Japanese Honinbo, league
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| Kobayashi Koichi 9p | Iwata Tatsuaki 9p | B+R | |
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| [1984-02-09] 39th Japanese Honinbo, league
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| Iwata Tatsuaki 9p | Kobayashi Koichi 9p | W+R | |
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| [1983-03-24] 38th Japanese Honinbo, league
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| Iwata Tatsuaki 9p | Kobayashi Koichi 9p | W+6.5 | |
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| [1983-01-13] 21st Japanese Judan, loser section semi-final
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| Iwata Tatsuaki 9p | Kobayashi Koichi 9p | W+0.5 | |
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| [1981-12-16] 37th Japanese Honinbo, league
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| Iwata Tatsuaki 9p | Kobayashi Koichi 9p | W+6.5 | |
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| [1979-05-17] 27th Japanese Oza, round 1
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| Iwata Tatsuaki 9p | Kobayashi Koichi 8p | W+5.5 | |
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