This page explains how Charles Richard Patton (USATT# 20719)'s rating went from 1873 to 1868 at the 1999 Decatur Open held on - 21 Aug 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.