JBvR tells us that Cho Chikun played four games in the 5th ACOM Cup.
Won the first, in round 1, as W against Yoda Norimoto, W+R, on 1998-06-08.
Won the second, in round 2, against Iwata Tatsuaki in July or August 1998.
Won the third, in round 3, as W against Yo Kagen, W+R, on 1998-08-20.
Lost the fourth, the final, as B against Kobayashi Satoru, W+R, on 1998-09-26.