This page explains how Chenguang Zhu (USATT# 91100)'s rating went from 2064 to 2038 at the Spttc Wednesday night league event from 16 Oct 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.