This page explains how Chiupong Huang (USATT# 88109)'s rating went from 1821 to 1819 at the LYTTC Friday Pro League event from 26 Jan 2018. 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.