This page explains how Robert Trudell (USATT# 60358)'s rating went from 1723 to 1639 at the Valley of the Sun Open held on - 6 Dec 1998. 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.