This page explains how Alan Tang (USATT# 81663)'s rating went from 2065 to 2061 at the Swan Friday O2000 Team League event from 30 Jun 2017. 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.