This page explains how Hsu-Chang Lu (USATT# 84845)'s rating went from 1847 to 1871 at the LYTTC Friday Pro League event from 6 Dec 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.