GoR Estimator allows Go (weiki, baduk) players in European tournaments to guess in advance how many EGF points they will gain or lose in their next go match, based on their own and their opponent's Go Rating Score, handicap...
It is a tiny J2ME application for use in small devices like mobile phones. It helps Go players to know how important their next match will be.
Formulas used come from the official European Go Federation pages. Since they use approximations, only an estimation can be made. The rating for each player is officially handled by EGF, and it is updated once per month.