This page explains how Lucas Sun Peng (USATT# 270889)'s rating went from 1021 to 1005 at the HITTA Weekly League event from 10 Dec 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.