I'm not gonna be of any help here. I tried a lot to beat that today, but I kept losing, over nad over. What bothers me is that you can't see the other player's score. If I could see that, i would probably try harder. I never liked a lot of these mini games in ff. For some reason, I never seem to get into them, or get remotely good at them.

All I know is you have to beat Shinra now, or else you have to beat him later, where he is a lot harder. I'm sure there's someone on this board who's a master at it, will give you good tips. Keep playing, you're bound to get it sooner or later. Good luck!