This page explains how Hsu-Chang Lu (USATT# 84845)'s rating went from 1809 to 1771 at the LYTTC TTcup event from 16 Feb 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.