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| O Rissei vs. Cho Chikun | |||
| Date | Venue | Result | |
| 1st | March 03 | Hiroshima | Cho Chikun (B) won by 0.5 |
| 2nd | March 17 | Niigata | O Rissei (B) won by 5.5 |
| 3rd | April 07 | Nagano | O Rissei (W) won by 19.5 |
| 4th | April 14 | Aichi | Cho Chikun (W) won by resign. |
| 5th | April 27 | Tokyo | Cho Chikun (B) won by 5.5 |
| Final | |||
| Date | Players | Venue | Result |
| Feb. 3, 2005 | Cho Chikun Takao Shinji |
Nihon Kiin | Cho Chikun (W) won by 1.5 |
| The 43th Judan Tournament | ||||||||
| Player | Round 1 | Round 2 | Round 3 | Round 4 | ||||
| Kobayashi Koichi | 1 | Mimura 5/27 |
9 | Mimura 7/22 |
13 | Mimura 9/23 |
15 | Cho C 11/18 |
| Mimura Tomoyasu | ||||||||
| O Meien | 2 | O Meien 6/24 |
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| Kobayashi Izumi | ||||||||
| Yamashita Keigo | 3 | Yoda 5/13 |
10 | Takao 8/2 |
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| Yoda Norimoto | ||||||||
| Kato Masao | 4 | Takao 5/27 |
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| Takao Shinji | ||||||||
| Suzuki Yoshimichi | 5 | Hikosaka 5/27 |
11 | Hikosaka 8/12 |
14 | Cho C 10/14 |
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| Hikosaka Naoto | ||||||||
| Kataoka Satoshi | 6 | Cho U 5/13 |
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| Cho U | ||||||||
| Yamada Kimio | 7 | Yamada 7/22 |
12 | Cho C 8/23 |
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| Rin Kaiho | ||||||||
| Cho Chikun | 8 | Cho C 5/20 |
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| Hashimoto Yujiro | ||||||||
| The 43th Judan Tournament (losers'tournament) | ||||||
| Player | Round 1 | Round 2 | Round 3 | Round 4 | Round 5 | |
| 1 | Kobayashi Koichi | Kobayashi K 7/29 |
Yamashita 9/23 |
Rin 10/14 |
Rin 12/16 |
Takao 1/20 |
| 2 | Kobayashi Izumi | |||||
| 3 | Yamashita Keigo | Yamashita 7/22 |
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| 4 | Kato Masao | |||||
| 5 | Suzuki Yoshimichi | Suzuki 7/29 |
Rin 9/2 |
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| 6 | Kataoka Satoshi | |||||
| 7 | Rin Kaiho | Rin 8/12 |
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| 8 | Hashimoto Yujiro | |||||
| 15 | Mimura Tomoyasu | |||||
| 9 | O Meien | Yoda 9/2 |
Yoda 11/25 |
Takao 12/16 |
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| 10 | Yoda Norimoto | |||||
| 11 | Cho U | Cho U 10/18 |
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| 12 | Yamada Kimio | |||||
| 13 | Takao Shinji | Takao 11/4 |
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| 14 | Hikosaka Naoto | |||||