This page explains how Haijun Zhao (USATT# 214612)'s rating went from 2086 to 2047 at the Boston TTC event from 17 Sep 2019. 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.