This page explains how Zhaoqun Zhou (USATT# 4287)'s rating went from 2042 to 2008 at the LYTTC Friday Pro League event from 21 Jul 2023. 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.