This page explains how Paul Villacarlos (USATT# 5399)'s rating went from 1239 to 1208 at the San Francisco Summer Open held on - 19 Aug 2001. 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.