Games Between Two Players
Kobayashi Koichi (16 win; 8 loss) vs. Sakata Eio
| Game Date and Game Description | |||||
| Black | White | Result | Replay | Download | |
 [1990-12-06] 46th Japanese Honinbo, league
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| Sakata Eio 9p | Kobayashi Koichi 9p | W+1.5 |  |
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| [1990-01-10] 45th Japanese Honinbo, league
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| Sakata Eio 9p | Kobayashi Koichi 9p | W+6.5 | |
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| [1987-05-21] 12th Japanese Gosei, semi-final
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| Kobayashi Koichi 9p | Sakata Eio 9p | B+R | |
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| [1987-01-22] 42nd Japanese Honinbo, league
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| Kobayashi Koichi 9p | Sakata Eio 9p | W+1.5 | |
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| [1986-02-02] 33rd Japanese NHK Cup, round 3
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| Kobayashi Koichi 9p | Sakata Eio 9p | B+R | |
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| [1984-07-12] 9th Japanese Kisei, 9 dan group final
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| Sakata Eio 9p | Kobayashi Koichi 9p | W+3.5 | |
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| [1984-03-22] 9th Japanese Meijin, league
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| Kobayashi Koichi 9p | Sakata Eio 9p | B+4.5 | |
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| [1984-02-16] 22nd Japanese Judan, challenger decision match
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| Kobayashi Koichi 9p | Sakata Eio 9p | B+5.5 | |
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| [1983-11-17] 39th Japanese Honinbo, league
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| Kobayashi Koichi 9p | Sakata Eio 9p | W+10.5 | |
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| [1983-03-10] 8th Japanese Meijin, league
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| Sakata Eio 9p | Kobayashi Koichi 9p | B+10.5 | |
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| [1982-12-16] 38th Japanese Honinbo, league
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| Kobayashi Koichi 9p | Sakata Eio 9p | B+R | |
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| [1982-07-25] 21st Japanese Judan, winner section round 1
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| Kobayashi Koichi 9p | Sakata Eio 9p | B+R | |
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| [1982-07-15] 7th Japanese Meijin, league
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| Kobayashi Koichi 9p | Sakata Eio 9p | W+T | |
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| [1981-12-24] 37th Japanese Honinbo, league
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| Sakata Eio 9p | Kobayashi Koichi 9p | W+9.5 | |
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| [1981-01-18] 13th Japanese Hayago Championship, semi-final
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| Kobayashi Koichi 9p | Sakata Eio 9p | W+7.5 | |
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| [1980-12-18] 6th Japanese Meijin, league
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| Kobayashi Koichi 9p | Sakata Eio 9p | B+7.5 | |
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| [1980-12-04] 19th Japanese Judan, loser section semi-final
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| Sakata Eio 9p | Kobayashi Koichi 9p | W+1.5 | |
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| [1980-05-22] 5th Japanese Meijin, league
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| Sakata Eio 9p | Kobayashi Koichi 9p | W+R | |
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| [1980-04-02] 28th Japanese Oza, preliminary
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| Kobayashi Koichi 9p | Sakata Eio 9p | B+7.5 | |
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| [1980-01-31] 35th Japanese Honinbo, league
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| Sakata Eio 9p | Kobayashi Koichi 9p | B+R | |
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| [1979-05-03] 34th Japanese Honinbo, league
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| Kobayashi Koichi 8p | Sakata Eio 9p | W+R | |
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| [1978-11-05] 26th Japanese NHK Cup, round 2
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| Kobayashi Koichi 8p | Sakata Eio 9p | B+R | |
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| [1976-06-27] 9th Japanese Hayago Championship, round 1
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| Kobayashi Koichi 7p | Sakata Eio 9p | W+R | |
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| [1974-11-28] 12th Japanese Pro Best Ten, round 2
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| Kobayashi Koichi 7p | Sakata Eio 9p | B+R | |
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