This page explains how Ethan Du (USATT# 88599)'s rating went from 2191 to 2156 at the Spttc Saturday Night League event from 23 Feb 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.