This page explains how Kelly Zhao (USATT# 86018)'s rating went from 2171 to 2159 at the 2019 DFWTT Fall League event from 12 Oct 2019. 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.