Tong Yang Securities Cup
The Tong Yang Securities Cup was a annual tournament sponsored by Tong Yang Securities (which now seems to have been renamed Tong Yang Investment Bank).
The 1st and 2nd Tong Yang Cup were a purely Korean tournament, but some Japanese, Chinese and Taiwanese players were invited as well. From the 3rd event onwards the tournament became a fully fledged world go championship. This third event was won by Yi Ch'ang-ho. It was his first international title, and can be considered to mark the beginning of Korean domination of world go.
|1st||1990||Yang Chae-ho||3-1||Chang Su-yeong|
|2nd||1991||Seo Pong-su||3-1||Yi Ch'ang-ho|
|3rd||1992||Yi Ch'ang-ho||3-2||Rin Kaiho|
|4th||1993||Yi Ch'ang-ho||3-0||Cho Chikun|
|5th||1994||Cho Hun-hyeon||3-1||Yoda Norimoto|
|6th||1995||Ma Xiaochun||3-1||Nie Weiping|
|7th||1996||Yi Ch'ang-ho||3-1||Ma Xiaochun|
|8th||1997||Cho Hun-hyeon||3-0||Kobayashi Satoru|
|9th||1998||Yi Ch'ang-ho||3-1||Yu Ch'ang-hyeok|
 Several sources give Chang Soohyun as his name.