This page explains how Thaddeus D. Robinson (USATT# 51346)'s rating went from 1556 to 1531 at the 40th St. Joseph Valley Open held on - 16 May 2004. 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.