I have recently review this film again. And it is still the best "gambling" film after all these years. Although Wong Jing was infamous with his not-too-good movies and dirty jokes. This one is a totally show off that proves he is one of the most talent writer/director in 80s Hong Kong.
Casino Raiders was released prior to "God of Gamblers" (also written and directed by Wong Jing), where the later has a better treater income. Personally speaking, the success of GOG is somehow related to the lead actor Chow Yun Fat, who was the hottest star at that time, and the story was filled with funny moments and local jokes which results a more releasing viewing experience, and more suitable to HK audience in 80s. In comparison, Casino Raiders features a more serious atmosphere, almost no local jokes at all, plus a better structured screenplay and twists. It is more suitable to call it a "gambling drama" (GOG is a cult movie instead).
Wong Jing is well known to HK audience that he likes all kind of gambling games: horse racing, casino games, cards, dice etc. I believe that is the reason why he could come up a script with so many gambling twists (and tricks).
Anyway, Casino Raiders is my most beloved movie of its kind. And it is recommended to anyone who is looking for a dramatic ride. One of the best (probably the only) from Wong Jing.