Taiwanese professional player born in 1957. Promoted 3 dan in 1984 (now retired).
His name is 陳士 in Traditional Chinese and 陈士 in Simplified.
He was the winner of the 9th, 10th and 11th Taiwan Mingren from 1983 to 1985. As a result of this, since it seems to have been Taiwan's only major title, the list of number one professionals in history suggests that he was the top Taiwanese player at this time.
Chinese profile at the PWD (w/ pic)