This page explains how Chenguang Zhu (USATT# 91100)'s rating went from 1844 to 1806 at the Swan Sunday League event from 21 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.