This page explains how Kwing Yiu Lau (USATT# 4097)'s rating went from 2143 to 2082 at the Boston TTC event from 17 Feb 2015. 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.