This page explains how Ziyi Ilenia Zhang (USATT# 271327)'s rating went from 856 to 842 at the 888 League event from 10 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.