This page explains how David Roberts (USATT# 55604)'s rating went from 2163 to 2150 at the 2016 Stiga Portland Open held on 12 Nov 2016 - 13 Nov 2016. 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.