This page explains how Chenguang Zhu (USATT# 91100)'s rating went from 1897 to 1852 at the ICC - Advanced League event from 6 Feb 2016. 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.