This page explains how Xinyi Zhen (USATT# 272563)'s rating went from 1224 to 1220 at the HITTA Weekly League event from 29 Oct 2022. 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.