This page explains how Youqing Shou (USATT# 277753)'s rating went from 844 to 840 at the AZ PTTC Monday event from 29 Jan 2024. 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.