This page explains how Clifford Lau (USATT# 1170683)'s rating went from 991 to 990 at the 2020 Princeton Pong November Open held on 7 Nov 2020 - 8 Nov 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.