This page explains how Bill Maguire (USATT# 19763)'s rating went from 1543 to 1531 at the BTTC League event from 30 Jun 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.