18th All-Japan Open Championship — IKO (1986)
20th All-Japan Open Championship — IKO (1988)
22nd All-Japan Open Championship — IKO (1990)
21st All-Japan Open Championship — IKO (1989)
24th All-Japan Open Championship — IKO (1992)
25th All-Japan Open Championship — IKO (1993)
26th All-Japan Open Championship — IKO (1994)
28th All-Japan Open Championship — IKO (1996)
29th All-Japan Open Championship — IKO (1997)
30th All-Japan Open Championship — IKO (1998)
