Adjustment for Goal Difference

As football is a game of probabilities, where a weaker team can beat a stronger team occasionally, narrow victories are not as significant as landslide victories.
In these Elo ratings, the number of points exchanged will be multiplied with the square-root of the goal difference if there is a winner. For a draw, the factor F stays 1. The square-root-formula is inspired by WSASU.

Created: 23 Mar 2013 - Modified: 20 May 2012