This page explains how David Edwards (USATT# 33602)'s rating went from 1580 to 1569 at the 2017 Stiga Portland Open held on 11 Nov 2017 - 12 Nov 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.