Ok... So I got an idea like the one in the title. Basically what I would want to do is develop a system that I could use when fighting with others. The thing is I'm no mathematical genius like some of you guys are and seriously need help to figure out how to make a system to work. I might be using this in an RP that's kinda like mix between Street Fighter/Moral Kombat and Soul Calibur style fighting games.
Now to the example.

HP 20/20
Guard: 2/2

-Unarmed Attacks-
Close-ranged Attack: 1
Semi-close ranged attack.: 1
Long-ranged attack: 1
Special Unarmed Attack: 1

-Armed Attacks-
Close-ranged Attack: 1
Semi-close ranged Attack: 1
Long-ranged Attack: 1
Special Armed Attack: 1

For starters the person making a character would have 45 points to spend for both of each attack type stat, guard stat and HP stat. So, it would require some kind of thinking to make a character which I like, but still quite easy enough. For HP 1 stat equals five(? Or possibly five for five points.) points of HP. And for guard it's 1 for 1. So the damage would be calculated like this: Guard - Damage = X damage. Pretty simple idea eh? Well anyways, this system wouldn't be for realistic fighting at all. So what should I tinker with? Any problems you notice... And I know it will be quite buggy but it's just for fun fighting. This system would also kill those no fun at all *Cut, dodge, cut, dodge, cut, dodgexInfinity* situations.

Maybe you should look up tabletop design - that's basically what you're doing here. The math that goes into getting a really balanced, functional system that supports RP instead of hinders it can be rough (although balance and polish might not be a huge deal if it is just going to be something really casual). You could try examining some rules-light systems and either see whether any of those would accomplish what you want or take some inspiration from the way they go about things. I can't give you a lot more advice than that, though, 'cause math is not my forte either.

Nocte, might want to talk to BBClock about his combat system. He's basically doing something similar and the two of you could probably bounce ideas off one another.