Dragon Ball Z Supersonic Warriors

I'm playing this game, on vba of course and I cant execute any desperation move. I know its R+A+B but my character either throws a strong Ki blast or punch.Any idea on solving this?

your keyboard most likely can't take 3 commands at once.
Best bet is to buy a joystick($10 at fry's for a good one)
or just assign 2 buttons to one key on your keyboard but being a fighter game im sure that will screw you over.