This page explains how Ethan He (USATT# 196903)'s rating went from 1238 to 1183 at the Topspin Open League event from 15 Sep 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.