This page explains how Alan Tang (USATT# 81663)'s rating went from 2032 to 2027 at the Swan Friday O2000 Team League event from 14 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.