Judan means "ten dan", is the fourth of the seven big titles in Japanese professional Go.
Due to the importance of the Judan as one of the "big seven" titles in Japan, there are several paths of automatic rank advancement through it in the Nihon Ki-in new promotion system. Challenging for the title warrants a promotion to 7-dan, actually winning the title promotes to 8-dan, and finally winning the title twice gives an immediate 9-dan promotion.
In Hikaru no Go[]
Current Holder[]
- Seiji Ogata
Winners of the Judan Title[]
- Koyo Toya
- Seiji Ogata
Famous or Familiar Judan Holders Include[]
- Koyo Toya
In Real Life[]
Current Holder[]
- Ida Atsushi
Winner of the Judan Title[]
- Ida Atsushi
Previous Judan Holders Include[]
- Cho Chikun,
- Iyama Yuta,
- Yuki Satoshi