This page explains how John Mc Dermott (USATT# 93518)'s rating went from 2253 to 2223 at the LYTTC Friday Pro League event from 7 Sep 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.