Regarding P2 advantage, a possible way to account for it might be a slight change in the rating formula. Right now if ratings are equal, the chance to win for both sides is assumed to be 0.5. To account for 2-3% of P2 advantage, we can modify the rating formula so that the probability of winning for equal rated opponents would be 0.47-0.48 for P1 and 0.52-0.53 for P2 (which for our standard Elo basically means just implying 14-20 points of extra rating for P2). Although the effect of this change is hardly to be any noticeable: the difference of rating gains/losses between old and new formulae will hardly be more than 1 point, and even that 1 point might be lost because of rounding (ratings are integers in the current implementation)
Statistics: Posted by dwarftough — Today, 3:44 am