This page explains how Alan Tang (USATT# 81663)'s rating went from 2057 to 2045 at the Swan Friday O2000 Team League event from 27 Mar 2015. 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.