Cho Son-jin
Cho Sonjin is a professional Go player.
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 Go [ranks and ratings|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
| Title | Years Lost |
| Current | 4 |
 |