(A bit difficult to describe this one, as the copy I saw had no subtitles GRRRRRR. However, things were helped by an occasional outbreak of English dialogue.)
As the opening credits clearly show, the contest between Ching and Ishikawa takes place in Bangkok. A cocky upstart spends much time crawling to Ching and his daughter Joey. Neither are fooled, and they each give him short shrift.
The contest begins, but the organizer announces that the S E Asia King of Gamblers title will be suspended for a month when Ching suffers an apparent heart attack, and that if no member of the family shows, the title will go to Ishikawa. Ching's loyal assistant turns out to be a traitor, killing his master (witnessed by BoBo) in favour of Ishikawa. BoBo takes an assassination assignment from Ishikawa, and his target is ? Joey. He can't do the job, and ends up saving her from the malevolent Alex Man, by taking her into hiding with his loyal pal.