This page explains how Alan Tang (USATT# 81663)'s rating went from 2059 to 2051 at the Swan Friday O2000 Team League event from 23 Dec 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.