This page explains how Brian Hutchins-Knowle (USATT# 62550)'s rating went from 1803 to 1781 at the WCTTA Saturday League event from 5 Dec 2015. 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.