This page explains how Alan Lin (USATT# 61647)'s rating went from 1867 to 1859 at the LYTTC Friday Pro League event from 16 Dec 2012. 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.