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Games played by Ko Iso
Total: 438; won: 216; winning percentage: 49.3%
| Game Date and Game Description | |||||
| Black | White | Result | Replay | Download | |
 [2025-07-07] 50th Japanese Kisei, league B1
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| Ko Iso 9p | Ryu Shikun 9p | B+6.5 |  |
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| [2025-06-12] 52nd Japanese Tengen, preliminary B
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| Ko Iso 9p | Yanagihara Saki 2p | B+R | |
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| [2025-06-02] 50th Japanese Kisei, league B1
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| Ko Iso 9p | Nishi Takenobu 5p | B+R | |
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| [2025-04-14] 50th Japanese Kisei, league B1
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| Wu Baiyi 6p | Ko Iso 9p | B+4.5 | |
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| [2025-03-17] 50th Japanese Kisei, league B1
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| Ko Iso 9p | Rin Kanketsu 8p | W+R | |
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| [2025-03-10] 73rd Japanese Oza, last preliminary
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| Ko Iso 9p | Mutsuura Yuta 8p | W+R | |
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| [2025-02-10] 50th Japanese Kisei, league B1
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| Ko Iso 9p | Cho U 9p | W+R | |
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| [2024-07-08] 49th Japanese Kisei, league C
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| Muramatsu Hiroki 7p | Ko Iso 9p | W+R | |
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| [2024-07-01] 63rd Japanese Judan, preliminary A
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| Yao Zhiteng 6p | Ko Iso 9p | W+R | |
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| [2024-06-06] 49th Japanese Kisei, league C
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| Ko Iso 9p | Omote Yuto 2p | B+R | |
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| [2023-11-02] 48th Japanese Kisei, league C
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| Ko Iso 9p | Yuki Satoshi 9p | W+R | |
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| [2023-10-26] 72nd Japanese Oza, preliminary A
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| Ko Iso 9p | Koyama Kuya 5p | W+R | |
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| [2023-08-24] 79th Japanese Honinbo, preliminary B
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| Kobayashi Koichi 9p | Ko Iso 9p | W+6.5 | |
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| [2023-07-24] 79th Japanese Honinbo, preliminary B
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| Ko Iso 9p | Mukai Chiaki 6p | B+R | |
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| [2023-07-17] 62nd Japanese Judan, preliminary A
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| Ko Iso 9p | Yamashita Keigo 9p | W+R | |
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| [2023-04-17] 32nd Japanese Ryusei, group E
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| Ko Iso 9p | Arimura Hiroshi 9p | W+R | |
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| [2023-02-27] 32nd Japanese Ryusei, group E
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| Adachi Toshimasa 7p | Ko Iso 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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| [2022-09-01] 47th Japanese Kisei, league C
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| Ko Iso 9p | Fukuoka Kotaro 3p | B+R | |
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| [2022-07-31] 70th Japanese NHK Cup, round 1
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| Ko Iso 9p | Taniguchi Toru 5p | B+R | |
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| [2022-03-31] 31st Japanese Ryusei, group H
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| Sun Zhe 7p | Ko Iso 9p | B+R | |
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| [2021-12-06] 48th Japanese Tengen, preliminary A
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| Yoda Norimoto 9p | Ko Iso 9p | B+0.5 | |
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| [2021-09-23] 46th Japanese Kisei, league C
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| O Meien 9p | Ko Iso 9p | B+R | |
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| [2021-09-02] 77th Japanese Honinbo, last preliminary
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| Ko Iso 9p | Yu Zhengqi 8p | W+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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| [2021-07-26] 69th Japanese NHK Cup, round 1
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| Ko Iso 9p | Hirose Yuichi 5p | W+R | |
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| [2021-06-17] 60th Japanese Judan, preliminary
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| Koike Yoshihiro 6p | Ko Iso 9p | W+R | |
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| [2021-05-27] 46th Japanese Kisei, league C
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| Ko Iso 9p | Yamada Kimio 9p | B+R | |
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| [2021-04-02] 76th Japanese Honinbo, league
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| Ko Iso 9p | Tsuruyama Atsushi 8p | B+R | |
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| [2021-03-18] 76th Japanese Honinbo, league
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| Ko Iso 9p | Shibano Toramaru 9p | W+R | |
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