This page explains how Xianyao He (USATT# 203271)'s rating went from 1599 to 1578 at the ICC - Advanced League event from 14 Apr 2018. 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.