This page explains how Ethan Zhou (USATT# 269593)'s rating went from 777 to 755 at the 2021 US National TT Championships Georgia State Qualifier held on 10 Apr 2021 - 11 Apr 2021. 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.