Han Ch'eol-kyun

한철균 (韓鐵均), b. 1955-01-04
Korean professional

Also Cheolgyun

9p 2019.04.25
8p 2012.04.02
7p 2005.01.26
6p 1998.01.01

At the start of 2022 (and indeed currently as of February) he is the lowest rated professional on Go Ratings. At that time he was placed #900.

KBA Ko. Wiki Wikidata Go4Go GoR

Previous versions of this page have claimed that he became 6p in 1999 and 8p on 2012-04-16. These dates are unsourced and contradicted by the KBA website.