This page explains how Lijia Zhen (USATT# 273785)'s rating went from 816 to 812 at the HITTA Weekly League event from 29 Jan 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.