This page explains how Kelvin Koh (USATT# 90486)'s rating went from 1965 to 1930 at the LYTTC Friday Pro League event from 3 Jul 2020. 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.