This page explains how Kwing Yiu Lau (USATT# 4097)'s rating went from 2131 to 2126 at the Boston TTC event from 17 Mar 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.