This page explains how Bill Maguire (USATT# 19763)'s rating went from 1579 to 1573 at the BTTC League event from 18 Dec 2018. 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.