(You could say Mythras/RQ6/MRQ2/Legend RPG is based on it, too).
Thing is, I find that it emulates better how things actually happen in a fight...based on my (admittedly limited) experience.
And I'd like to use it for a game based around a boxing story. You know, like Rocky, Hajime no Ippo, the Raging Bull, and the like.
How would I do it?
Everything has a TN from 2 to 8.
Roll anywhere from 3 to 6 dice. Any doubles add 1 (or 2) to the number rolled, tripples add three times this. The downside, of course, is that they take up your possible actions.
Declare your intentions before rolling, if you declare 3 or more, roll one die less. One of your actions is "impede the attack", raising the TN to be hit.
Now roll, and assign whatever you rolled to one of the actions. See what happened.
Hmm, I need to work more on it.