Hooooooo, thanks Sir. Well, I wish I knew how to use those triggers... I'm not even sure what you can do with it, I thought I understood at some points but turns out I didn't, and there's no tutorials D:
You basically need to assign the bodypart/joint that has to be hit to gain points to one group and bodyparts/joints that need to be hit with to another one and connect them via "collide with" parameter.
i.e. to get instant 10k points for touching opponent's head with your fist you can assign head to group 1 and set collide with group 2 + assign fists to group 2 and set collide with group 1. After that, set trigger score to 10000 for head in Body Score section and it's done.