This page explains how Kelvin Koh (USATT# 90486)'s rating went from 2025 to 1977 at the NJTTC Monday League event from 20 Jan 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.