|Full name||Cho Sonjin|
|Revised Romanization||Jo Seon-jin|
April 18, 1970|
Cho was born in South Korea, but moved to Japan at age 12 in order to become a professional. He accomplished his goal two years later in 1984. 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.
Titles and runners-up
|Agon Cup||2000, 2001|
|China-Japan Agon Cup||2000, 2001|
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