This page explains how Zhaoqun Zhou (USATT# 4287)'s rating went from 2052 to 2028 at the Topspin Advanced League event from 13 Apr 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.