This page explains how Guanlun Xu (USATT# 218222)'s rating went from 1341 to 1312 at the Boston TTC Div.B event from 18 Dec 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.