This page explains how Geoffrey Cheng (USATT# 91967)'s rating went from 2210 to 2181 at the LYTTC Friday Pro League event from 20 Sep 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.