This page explains how Zhizeng Sun (USATT# 88210)'s rating went from 1866 to 1859 at the HITTA Weekly League event from 2 Sep 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.