This page explains how Guo Tai Du (USATT# 88098)'s rating went from 2031 to 2005 at the Westchester Two-Person Teams Championship held on 4 Sep 2021 - 6 Sep 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.