This page explains how David Jinxuan Su (USATT# 268653)'s rating went from 643 to 633 at the Matchpoint TTC Friday League event from 3 Sep 2021. 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.