This page explains how John Mc Dermott (USATT# 93518)'s rating went from 2222 to 2209 at the LYTTC Friday Pro League event from 9 Aug 2019. 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.