This page explains how William O. Dorsey (USATT# 5430)'s rating went from 1390 to 1379 at the Irving Round Robin 2004 held on - 22 Feb 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.