This page explains how Hongxuan Zhu (USATT# 218441)'s rating went from 1950 to 1919 at the LYTTC TTcup event from 18 May 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.