Taiwanese player born 1981-09-13, pupil of Kim Won? 6 dan of Korea. Promoted 1 dan in 1999 and 3 dan in 2002, Yoo was promoted 4 dan of Hankuk Ki-won in 2004-02 and 5 dan on 2005-05-12. Now (2009) he plays in Taiwan and was promoted 6 dan.
In 2010 Hankuk Ki-won promoted Yoo to 8 dan.
valerio: In 2010 Hankuk Kiwon promoted to 8 dan: Lee Youngsin?, former 5 dan, Yun Yeong-seon, former 5 dan, Kim Sung-Rae, former 4 dan, An Younggil, former 6 dan, Yoo Kyeongmin, former 5 dan, Lee Kwangwook?, former 3 dan, Cho Mikyung, former 1 dan, Ko Juyeon?, former 3 dan. They migrated outside Korea. Can someone explain this strange thing?