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| Kato Masao vs. Cho U | |||
| Date(2003) | Venue | Result | |
| 1 | 14, 15 May | Cheju Island in Korea | Kato (B) won by resign. |
| 2 | 26, 27 May | Kita Kyushu | Cho (B) won by resign. |
| 3 | 02, 03 Jun | Chitose | Kato (B) won by resign. |
| 4 | 16, 17 Jun | Shiga | Cho (B) won by resign. |
| 5 | 25, 26 Jun | Gifu | Cho (W) won by resign. |
| 6 | 10, 11 Jul | Oita | Cho (B) won by 9.5. |
| 7 | 23, 24 Jul | Hiratsuka | --- |
| Chellenger's Play-Off | |
| O Meien vs. Cho U | |
| Date(2003) | Result |
| April 7 | Cho U (B) won by 5.5 |
| in the chart | * B = playing black, W = playing white * 1 = win, 0 = loss |
| RNK | Final | Player | O | U | Son | Chi | Kob | Rin | Ryu | Yam | Score |
| 1 | Play-off | O Meien | - | B 0
Feb. |
W 1
Dec. |
B 1
Mar. |
W 1
Oct. |
B 1
Apr. |
W 1
Jan. |
B 1
Nov. |
6-1 |
| 2 | Play-off | Cho U | W 1
Feb. |
- | B 1
Mar. |
W 1
Dec. |
B 1
Jan. |
W 1
Nov. |
B 1
Oct. |
W 0
Apr. |
6-1 |
| 3 | D | Cho Sonjin | B 0
Dec. |
W 0
Mar. |
- | B 1
Feb. |
W 0
Nov. |
B 0
Jan. |
W 0
Apr. |
B 1
Oct. |
2-5 |
| 4 | D | Cho Chikun | W 0
Mar. |
B 0
Dec. |
W 0
Feb. |
- | B 1
Apr. |
W 1
Oct. |
B 0
Nov. |
W 0
Jan. |
2-5 |
| 5 | 4 | Kobayashi Koichi | B 0
Oct. |
W 0
Jan. |
B 1
Nov. |
W 0
Apr. |
- | B 1
Mar. |
W 1
Feb. |
B 0
Dec. |
3-4 |
| 5 | D | Rin Kaiho | W 0
Apr. |
B 0
Nov. |
W 1
Jan. |
B 0
Oct. |
W 0
Mar. |
- | B 1
Dec. |
W 0
Feb. |
2-5 |
| 5 | D | Ryu Shikun | B 0
Jan. |
W 0
Oct. |
B 1
Apr. |
W 1
Nov. |
B 0
Feb. |
W 0
Dec. |
- | B 0
Mar. |
2-5 |
| 5 | 3 | Yamashita Keigo | W 0
Nov. |
B 1
Apr. |
W 0
Oct. |
B 1
Jan. |
W 1
Dec. |
B 1
Feb. |
W 1
Mar. |
- | 5-2 |