This page explains how James Petrie (USATT# 55556)'s rating went from 1508 to 1468 at the St. Louis Spring Open held on - 24 Apr 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.