This page explains how Chenguang Zhu (USATT# 91100)'s rating went from 2061 to 2053 at the Spttc Wednesday night league event from 7 Aug 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.