This page explains how Zhizeng Sun (USATT# 88210)'s rating went from 1820 to 1820 at the 2021 HITTA Butterfly Halloween Open held on 29 Oct 2021 - 31 Oct 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.