This page explains how Zhaoqun Zhou (USATT# 4287)'s rating went from 2057 to 2043 at the Topspin Advanced League event from 29 Dec 2018. 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.