This page explains how Kelvin Koh (USATT# 90486)'s rating went from 1974 to 1929 at the NJTTC Thursday Adv League event from 10 Aug 2017. 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.