This page explains how Ethan Jiao (USATT# 271482)'s rating went from 893 to 873 at the HITTA Weekly League event from 1 Jan 2023. 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.