Yu Ch'ang-hyeok
Yoo Changhyuk 9-dan is one of Korea's top players, and probably about third in world.
Yu was born on 25 April 1966 and is South Korean. It is said that he is mainly self-taught and never had a proper master (like Yi or Cho). He has won numerous titles.
Charles Matthews: He is presently the best thickness and attacking player. His style is to play for influence, his strength in the conversion of attacking positions into advantage in the endgame.
External links
His web-site (in Korean): http://www.youchanghyuk.com