This page explains how David Roberts (USATT# 55604)'s rating went from 2174 to 2129 at the 2015 BTTC Summer Open held on - 21 Jun 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.