This page explains how John Maes (USATT# 10097)'s rating went from 1253 to 1275 at the San Francisco Summer Open held on - 22 Aug 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.