How do the ratings work?
Player ratings are calculated as a weighted average of player results from the past 45 months.
Every time the ratings are recalculated, the algorithm looks to all matches played within the past 45 months and factors in all of these results as well as all of the results of your opponents. It is possible that a player's ratings changes based on the new results of his past opponents, even if he has not played any matches recently. The algorithm looks at direct match results, indirect match results, and specific match scores (3-0, 3-1, 3-2). Additionally, the algorithm weights recent matches more heavily than older matches. Finally, the algorithm establishes the elasticity of a player's rating: if a player has played lots of matches, there is an assumption that the player's rating is relatively accurate and will be less likely to change significantly; if a player has played relatively few matches, their rating is less likely to be as accurate and therefore match results for that player can produce larger changes.
The rating scale runs from 1.0 for beginners to over 7.0 for top world professionals. The majority of squash players are in the 2.5-4.5 range, which coincides to what was formerly referred to as “C” or “B” level players.
Ratings are calculated in one pool for all players including juniors and adults, men and women, and also across all leagues, tournaments, and friendly matches. The more matches a player enters, the more accurate his or her rating will be.