This page explains how Kelvin Koh (USATT# 90486)'s rating went from 2087 to 2081 at the NJTTC Monday League event from 1 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.