This page explains how Arden Shi (USATT# 269635)'s rating went from 640 to 641 at the Princeton Pong Leagues event from 5 Dec 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.