Its quality of points over quantity. Better arguments get more points, and rubbish/repeated/refuted arguments get none. However quantity of course comes into it. I mean if some says, oh the SE will win cause they got Sith are their tough. Thats not going to win the whole debate is it? Even if it is a good point.
Well I disagree with the method of descision (quantity of points favoured over quality) but it appears congratulations are in order for the SE.
Basically its the most comprehensive way of deciding the victor.