This page explains how Winston Briggs (USATT# 201726)'s rating went from 1517 to 1515 at the LYTTC Friday Pro League event from 25 May 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.