This page explains how Richard and Susan Butler (USATT# 4599)'s rating went from 2453 to 2420 at the Southern Tour #1 held on - 10 Sep 1994. 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.