This page explains how Bryan Zhong (USATT# 1172523)'s rating went from 181 to 181 at the 2021 Butterfly/Sonesta Select November Tournament held on 7 Nov 2021 - 7 Nov 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.