Games Between Two Players
Ko Iso (4 win; 4 loss) vs. Sakai Hideyuki
| Game Date and Game Description | |||||
| Black | White | Result | Replay | Download | |
 [2018-05-31] 25th Japanese Agon Cup, preliminary
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| Sakai Hideyuki 8p | Ko Iso 8p | B+R |  |
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| [2017-05-11] 42nd Japanese Meijin, league
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| Ko Iso 8p | Sakai Hideyuki 8p | W+4.5 | |
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| [2015-08-16] 63rd Japanese NHK Cup, round 2
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| Sakai Hideyuki 8p | Ko Iso 8p | W+R | |
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| [2015-07-16] 40th Japanese Kisei, league B1
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| Ko Iso 8p | Sakai Hideyuki 8p | B+R | |
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| [2015-01-22] 40th Japanese Gosei, round 1
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| Ko Iso 8p | Sakai Hideyuki 8p | B+R | |
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| [2008-07-03] 33rd Japanese Meijin, league
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| Ko Iso 7p | Sakai Hideyuki 7p | W+2.5 | |
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| [2007-05-10] 32nd Japanese Meijin, league
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| Sakai Hideyuki 7p | Ko Iso 7p | B+R | |
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| [2006-04-06] 31st Japanese Meijin, league
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| Ko Iso 7p | Sakai Hideyuki 7p | B+0.5 | |
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