This page explains how Justin Ni (USATT# 271371)'s rating went from 217 to 211 at the Pong Planet Friday Night, Tuesday Night, And Saturday Leagues event from 7 Dec 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.