Games Between Two Players
Ko Iso (6 win; 14 loss) vs. Yamashita Keigo
| Game Date and Game Description | |||||
| Black | White | Result | Replay | Download | |
 [2023-07-17] 62nd Japanese Judan, preliminary A
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| Ko Iso 9p | Yamashita Keigo 9p | W+R |  |
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| [2022-11-20] 70th Japanese NHK Cup, round 2
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| Yamashita Keigo 9p | Ko Iso 9p | B+R | |
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| [2021-07-29] 77th Japanese Honinbo, preliminary
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| Yamashita Keigo 9p | Ko Iso 9p | W+R | |
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| [2019-10-10] 58th Japanese Judan, round 2
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| Yamashita Keigo 9p | Ko Iso 8p | W+R | |
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| [2018-11-29] 74th Japanese Honinbo, league
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| Ko Iso 8p | Yamashita Keigo 9p | W+R | |
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| [2018-04-12] 43rd Japanese Meijin, league
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| Ko Iso 8p | Yamashita Keigo 9p | W+R | |
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| [2018-04-05] 73rd Japanese Honinbo, league
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| Ko Iso 8p | Yamashita Keigo 9p | W+R | |
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| [2017-07-13] 42nd Japanese Meijin, league
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| Ko Iso 8p | Yamashita Keigo 9p | W+R | |
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| [2017-04-20] 43rd Japanese Tengen, round 2
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| Ko Iso 8p | Yamashita Keigo 9p | W+R | |
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| [2016-11-03] 72nd Japanese Honinbo, league
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| Yamashita Keigo 9p | Ko Iso 8p | W+R | |
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| [2016-05-12] 41st Japanese Meijin, league
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| Ko Iso 8p | Yamashita Keigo 9p | B+1.5 | |
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| [2015-07-30] 40th Japanese Meijin, league
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| Ko Iso 8p | Yamashita Keigo 9p | W+R | |
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| [2014-09-28] 62nd Japanese NHK Cup, round 2
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| Ko Iso 8p | Yamashita Keigo 9p | B+R | |
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| [2014-02-17] 39th Japanese Meijin, league
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| Yamashita Keigo 9p | Ko Iso 8p | B+R | |
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| [2013-01-10] 68th Japanese Honinbo, league
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| Ko Iso 8p | Yamashita Keigo 9p | W+R | |
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| [2009-07-09] 16th Japanese Agon Cup, round 2
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| Ko Iso 7p | Yamashita Keigo 9p | W+R | |
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| [2008-12-21] 56th Japanese NHK Cup, round 3
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| Ko Iso 7p | Yamashita Keigo 9p | W+R | |
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| [2008-06-12] 34th Japanese Tengen, round 3
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| Yamashita Keigo 9p | Ko Iso 7p | W+4.5 | |
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| [2007-02-12] 32nd Japanese Meijin, league
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| Ko Iso 7p | Yamashita Keigo 9p | W+R | |
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| [2006-06-01] 31st Japanese Meijin, league
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| Yamashita Keigo 9p | Ko Iso 7p | B+5.5 | |
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