This page explains how Zhaoqun Zhou (USATT# 4287)'s rating went from 2061 to 2033 at the Topspin Advanced League event from 25 May 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.