This page explains how Brian Chen (USATT# 31519)'s rating went from 2081 to 2056 at the 1st AMDT San Fran Open TT Cham held on - 8 Nov 2009. 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.