This page explains how Xianliang He (USATT# 256702)'s rating went from 1644 to 1640 at the ICC - Advanced League event from 23 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.