It is well known how the ELO system works. Some aspect of it is, however, puzzling.
I don't see why would the statistics not take into account the color of the player (when ELO is used for chess not football
) ). It is a well established stastical fact that white wins more.
It seems that the above has namy consequences in the local chess culture here. E.g, in the open-invites list you mainly see "white" (around 70 percents I guess). As a result, many players here don't experience the "black side" almost at all (not to damage the rating).
I think some slight asymmetry in the rating system is necessary for the benefit of the chess community.