This page explains how Kelvin Koh (USATT# 90486)'s rating went from 2108 to 2064 at the LYTTC Friday Pro League event from 6 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.