Games Between Two Players
Kobayashi Koichi (17 win; 15 loss) vs. Yamashiro Hiroshi
| Game Date and Game Description | |||||
| Black | White | Result | Replay | Download | |
 [2023-02-02] 2nd Japanese Teikei Cup Legend Tournament, round 3
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| Kobayashi Koichi 9p | Yamashiro Hiroshi 9p | W+4.5 |  |
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| [2017-12-21] 66th Japanese Oza, preliminary
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| Kobayashi Koichi 9p | Yamashiro Hiroshi 9p | W+4.5 | |
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| [2014-05-08] 4th Japanese Igo Masters Cup, round 2
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| Yamashiro Hiroshi 9p | Kobayashi Koichi 9p | W+R | |
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| [2013-05-13] 3rd Japanese Igo Masters Cup, round 2
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| Yamashiro Hiroshi 9p | Kobayashi Koichi 9p | B+4.5 | |
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| [2011-09-29] 36th Japanese Kisei, league B
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| Yamashiro Hiroshi 9p | Kobayashi Koichi 9p | B+3.5 | |
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| [2007-06-10] 55th Japanese NHK Cup, round 1
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| Kobayashi Koichi 9p | Yamashiro Hiroshi 9p | B+R | |
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| [2006-08-24] 45th Japanese Judan, loser section round 2
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| Yamashiro Hiroshi 9p | Kobayashi Koichi 9p | B+R | |
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| [1997-06-19] 22nd Japanese Kisei, 9 dan group final
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| Yamashiro Hiroshi 9p | Kobayashi Koichi 9p | W+1.5 | |
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| [1995-04-13] 50th Japanese Honinbo, league
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| Kobayashi Koichi 9p | Yamashiro Hiroshi 9p | B+R | |
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| [1993-02-10] 48th Japanese Honinbo, league
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| Kobayashi Koichi 9p | Yamashiro Hiroshi 9p | W+1.5 | |
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| [1992-10-08] 18th Japanese Tengen, challenger decision match
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| Yamashiro Hiroshi 9p | Kobayashi Koichi 9p | B+R | |
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| [1992-08-12] 40th Japanese Oza, semi-final
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| Yamashiro Hiroshi 9p | Kobayashi Koichi 9p | W+R | |
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| [1992-06-04] 31st Japanese Judan, winner section round 1
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| Yamashiro Hiroshi 9p | Kobayashi Koichi 9p | B+1.5 | |
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| [1992-03-18] 16th Japanese Kisei, title match #7
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| Yamashiro Hiroshi 9p | Kobayashi Koichi 9p | W+0.5 | |
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| [1992-03-11] 16th Japanese Kisei, title match #6
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| Kobayashi Koichi 9p | Yamashiro Hiroshi 9p | B+4.5 | |
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| [1992-02-26] 16th Japanese Kisei, title match #5
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| Yamashiro Hiroshi 9p | Kobayashi Koichi 9p | B+6.5 | |
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| [1992-02-19] 16th Japanese Kisei, title match #4
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| Kobayashi Koichi 9p | Yamashiro Hiroshi 9p | B+5.5 | |
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| [1992-02-05] 16th Japanese Kisei, title match #3
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| Yamashiro Hiroshi 9p | Kobayashi Koichi 9p | W+1.5 | |
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| [1992-01-29] 16th Japanese Kisei, title match #2
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| Kobayashi Koichi 9p | Yamashiro Hiroshi 9p | W+4.5 | |
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| [1992-01-16] 16th Japanese Kisei, title match #1
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| Yamashiro Hiroshi 9p | Kobayashi Koichi 9p | B+R | |
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| [1991-08-14] 30th Japanese Judan, loser section round 1
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| Yamashiro Hiroshi 9p | Kobayashi Koichi 9p | W+0.5 | |
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| [1989-01-11] 44th Japanese Honinbo, league
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| Yamashiro Hiroshi 9p | Kobayashi Koichi 9p | B+0.5 | |
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| [1988-02-10] 43rd Japanese Honinbo, league
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| Kobayashi Koichi 9p | Yamashiro Hiroshi 9p | B+R | |
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| [1987-02-08] 19th Japanese Hayago Championship, semi-final
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| Kobayashi Koichi 9p | Yamashiro Hiroshi 9p | B+R | |
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| [1986-12-25] 42nd Japanese Honinbo, league
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| Kobayashi Koichi 9p | Yamashiro Hiroshi 9p | W+R | |
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| [1986-12-11] 12th Japanese Meijin, league
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| Kobayashi Koichi 9p | Yamashiro Hiroshi 9p | B+R | |
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| [1986-04-10] 41st Japanese Honinbo, league
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| Kobayashi Koichi 9p | Yamashiro Hiroshi 9p | W+4.5 | |
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| [1985-07-11] 10th Japanese Meijin, league
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| Yamashiro Hiroshi 8p | Kobayashi Koichi 9p | W+2.5 | |
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| [1985-04-18] 40th Japanese Honinbo, league
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| Yamashiro Hiroshi 8p | Kobayashi Koichi 9p | W+R | |
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| [1983-12-22] 39th Japanese Honinbo, league
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| Yamashiro Hiroshi 8p | Kobayashi Koichi 9p | B+1.5 | |
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| [1980-01-17] 5th Japanese Meijin, league
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| Kobayashi Koichi 9p | Yamashiro Hiroshi 6p | B+R | |
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| [1976-11-14] 8th Japanese Shinei Tournament, round 1
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| Kobayashi Koichi 7p | Yamashiro Hiroshi 5p | B+3.5 | |
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