Background
Cho was born in South of Korea, but moved to Japan at age 12 in order to become a professional.
Cho was born in South of Korea, but moved to Japan at age 12 in order to become a professional.
He was promoted to 9 dan in 1998. In 1999, he defeated Cho Chikun in the Honinbo, ending Chikun"s 10-year run with the title.