17 Aug 2021
This page explains how Xuedong Chai (USATT# 267640)'s rating went from 327 to 321 at the Pong Planet Friday Night, Tuesday Night, And Saturday Leagues event from 17 Aug 2021. The links below take you to pages that describe various aspects of the ratings processor.
The ratings 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.