This page explains how Chenguang Zhu (USATT# 91100)'s rating went from 1889 to 1887 at the Spttc Saturday Night League event from 17 Jun 2017. 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.