This page explains how Alton Zhao (USATT# 273085)'s rating went from 1158 to 1154 at the ICC - Advanced League event from 14 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.