Originally Posted by Playtennis
Thanks. Ok taking this to another level. She self rates today at say 4.0 plays a few matches in 2012 but not enough to get rating. End of next year does computer only use 2013 results or also use 2012 matches and average 12 and 13? I thought early matches drop off?
None of us know for sure because the formula is a secret. But my understanding is below.
All matches will count forever. However, the further you get away from any particular match they become increasingly less important. The dynamic rating is kind of like a running average that weights the more recent matches more heavily than the earliest matches.