This page explains how Harriet Quon (USATT# 2132)'s rating went from 1241 to 1255 at the Sun City Open Senior TTT held on - 1 May 1999. The links below take you to pages that describe various aspects of the rating processor.

The rating processor goes through 4 passes in order. The links take you to pages that provide detailed explanations of the calculations during each of the 4 passes.