This page explains how David Lam (USATT# 85278)'s rating went from 1862 to 1840 at the LYTTC Friday Pro League event from 21 May 2016. 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.