Why don’t best 2 out of 3 matches count towards ratings?
US Squash defines an accredited match as best 3 out of 5 games using PAR-11 (point-a-rally) scoring. Therefore, the rating algorithm only factors in matches that meet this standard so that results are comparable. This rule/assumption allows more accurate mathematical comparisons to be made as all matches operate on the same scale. This increases that accuracy of the ratings calculation and allows the ratings metric to be more representative of each players' level of play in a full match situation.