This page explains how Xiheng Tyrus Zhang (USATT# 271325)'s rating went from 232 to 221 at the 888 League event from 29 Aug 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.