This page explains how Weisung Tsao (USATT# 28857)'s rating went from 2129 to 2126 at the Bay Area Table Tennis Federation event from 11 Dec 2008. 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.