This page explains how Norm (Pete) McAllister (USATT# 20962)'s rating went from 805 to 773 at the New England Open Championship held on - 13 Oct 2001. 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.