I delete any prize points when

I see that a player is sitting on a high score without playing at least one game within three days. The intent of this competition is to play rapid chess and compete with other players of similar skills. That does not mean playing with the same person over and over to try and defeat the competition.  I will be ensuring that a player's average changes enough times to know that they are not sitting on a high score, hoping to be paired with others with high scores.