just basically a way for me to keep it fair. every new fighter gets an ID number and they increase by one each time. so if a fighter has an ID of 250000 i know he's been training a lot longer than an ID of 310000+.now that you mention it, I think it's the time for me to ask what's the deal with these IDs? I couldn't understand it yet.
you can have two 25 year olds. a beast who has been training since 18, and a brand new fighter. besides their stats you can look at ID to determine their skill level.