This page explains how Ethan He (USATT# 196903)'s rating went from 1219 to 1211 at the Topspin Open League event from 19 Oct 2018. 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.