This page explains how Karen Hu (USATT# 264525)'s rating went from 858 to 841 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.