This page explains how Gang Xiong (USATT# 266555)'s rating went from 923 to 915 at the Pong Planet Friday Night, Tuesday Night, And Saturday Leagues event from 19 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.