Cho Sonjin

Cho Sonjin (born April 18, 1970) is a professional Go player. Cho spent 12 years in South Korea before deciding to leave and become a professional in Japan, accomplishing his goal two years later. 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.