This page explains how Ethan Xiao (USATT# 275494)'s rating went from 20 to 9 at the Pong Planet Friday Night, Tuesday Night, And Saturday Leagues event from 10 Sep 2022. 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.