This page explains how John Mc Dermott (USATT# 93518)'s rating went from 2229 to 2209 at the LYTTC Friday Pro League event from 19 Oct 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.