This page explains how Kwing Yiu Lau (USATT# 4097)'s rating went from 2100 to 2057 at the Boston TTC event from 5 Mar 2019. 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.