Seo Pong-su (also written Suh Bongsoo and suchlike), Korean 9-dan professional. Born 1 February 1953. Throughout the 1980's he was Cho Hun-hyeon's main rival in the top Korean tournaments. In the early 1990's he was recognised as one of the "gang of four" who dominated the Korean go scene. Although he won the 2nd Ing Cup in 1993, he has generally been less successful than the rest of the gang of four (Cho Hun-hyeon, Yi Ch'ang-ho and Yu Ch'ang-hyeok) in international events. But in the 6th SBS Cup (1996-1997), playing board four for Korea, he single-handedly defeated the entire Chinese team and all that was left of the Japanese team - a sequence of 9 consecutive wins comparable with Nie Weiping's successes in the Japan-China matches a decade earlier.