This page explains how Bill Maguire (USATT# 19763)'s rating went from 1590 to 1579 at the BTTC League event from 19 Jun 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.