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Games played by Osuka Seira
Total: 40; won: 13; winning percentage: 32.5%
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| Black | White | Result | Replay | Download | |
 [2025-02-13] 12th Japanese Aidu Chuo Hospital Cup, preliminary
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| Osuka Seira 2p | Mori Chisaki 2p | W+5.5 |  |
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| [2025-02-06] 44th Japanese Female Honinbo, preliminary
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| Osuka Seira 2p | Moro Arisa 2p | W+R | |
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| [2024-11-28] 10th Senko Cup Women's Strongest, preliminary
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| Yoshihara Yukari 6p | Osuka Seira 2p | B+R | |
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| [2024-10-31] 44th Japanese Female Honinbo, preliminary
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| Osuka Seira 2p | Shimosaka Miori 3p | B+4.5 | |
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| [2024-02-08] 43rd Japanese Female Honinbo, preliminary
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| Tsuji Hana 3p | Osuka Seira 2p | B+2.5 | |
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| [2024-01-22] 9th Senko Cup Women's Strongest, preliminary
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| Osuka Seira 2p | Jo Bunen 2p | W+R | |
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| [2023-12-04] 49th Japanese Shinjin O, preliminary
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| Goto Ichi 1p | Osuka Seira 2p | B+R | |
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| [2023-11-27] 63rd Japanese Judan, preliminary C
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| Nakaonoda Tomomi 9p | Osuka Seira 2p | B+R | |
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| [2023-11-16] 27th Japanese Female Kisei, round 2
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| Ueno Asami 5p | Osuka Seira 2p | B+9.5 | |
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| [2023-10-26] 27th Japanese Female Kisei, round 1
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| Mimura Kaori 3p | Osuka Seira 2p | W+0.5 | |
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| [2023-04-13] 42nd Japanese Female Honinbo, round 1
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| Moro Arisa 2p | Osuka Seira 2p | B+R | |
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| [2023-03-27] 49th Japanese Gosei, preliminary C
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| Onda Yasuhiko 9p | Osuka Seira 1p | W+R | |
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| [2023-03-09] 42nd Japanese Female Honinbo, preliminary
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| Yoshihara Yukari 6p | Osuka Seira 1p | W+R | |
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| [2022-12-12] 48th Japanese Kisei, preliminary
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| Oya Koichi 9p | Osuka Seira 1p | B+6.5 | |
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| [2022-11-17] 8th Senko Cup Women's Strongest, preliminary
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| Aoba Kaori 5p | Osuka Seira 1p | B+4.5 | |
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| [2022-10-31] 26th Japanese Female Kisei, round 1
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| Osuka Seira 1p | Takao Mari 1p | W+0.5 | |
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| [2022-04-21] 41st Japanese Female Honinbo, round 1
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| Osuka Seira 1p | Ueno Risa 1p | W+8.5 | |
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| [2022-04-01] 3rd Japanese Discovery Cup, preliminary
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| Osuka Seira 1p | Cho Koharu 1p | B+R | |
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| [2022-04-01] 3rd Japanese Discovery Cup, preliminary
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| Fujisawa Rihide Insei | Osuka Seira 1p | B+2.5 | |
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| [2022-04-01] 3rd Japanese Discovery Cup, preliminary
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| Hirano Kaito Insei | Osuka Seira 1p | B+R | |
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| [2022-02-28] 47th Japanese Shinjin O, round 1
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| Osuka Seira 1p | Moro Arisa 2p | W+R | |
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| [2021-12-06] 47th Japanese Shinjin O, preliminary
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| Tsukada Chiharu 1p | Osuka Seira 1p | W+R | |
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| [2021-10-11] 25th Japanese Female Kisei, round 1
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| Osuka Seira 1p | Xie Yimin 7p | W+R | |
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| [2021-09-02] 31st Japanese Ryusei, group A
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| Seki Kotaro 4p | Osuka Seira 1p | B+9.5 | |
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| [2021-07-21] 2nd Japanese Discovery Cup, preliminary
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| Tanaka Yuki 1p | Osuka Seira 1p | B+R | |
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| [2021-04-05] 8th GLOBIS Cup, Japanese preliminary
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| Osuka Seira 1p | Kitazawa Masaaki 1p | W+R | |
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| [2021-02-18] 60th Japanese Judan, preliminary
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| Sugiuchi Kazuko 8p | Osuka Seira 1p | W+R | |
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| [2020-11-30] 40th Japanese Female Honinbo, preliminary
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| Ueno Risa 1p | Osuka Seira 1p | B+9.5 | |
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| [2020-10-08] 24th Japanese Female Kisei, round 1
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| Osuka Seira 1p | Konishi Kazuko 8p | W+4.5 | |
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| [2020-01-27] 7th GLOBIS Cup, Japanese preliminary
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| Osuka Seira 1p | Nakamura Sumire 1p | W+R | |
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