This page explains how Kwing Yiu Lau (USATT# 4097)'s rating went from 2137 to 2131 at the Boston TTC event from 24 Jan 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.