This page explains how Alan Bruce Williams (USATT# 11122)'s rating went from 865 to 861 at the 1999 MATTC October Open held on - 24 Oct 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.