This page explains how Xuedong Chai (USATT# 267640)'s rating went from 453 to 434 at the Pong Planet Friday Night, Tuesday Night, And Saturday Leagues event from 8 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.