This page explains how Steve Isaacson (USATT# 6924)'s rating went from 1805 to 1793 at the St. Joseph Valley Open held on - 30 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.