This page explains how Guanlun Xu (USATT# 218222)'s rating went from 840 to 940 at the Boston TTC Div.B event from 14 Aug 2017. 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.