This page explains how Kelvin Koh (USATT# 90486)'s rating went from 2089 to 2026 at the LYTTC Friday Pro League event from 25 Oct 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.