This page explains how David Feerst (USATT# 77511)'s rating went from 1717 to 1639 at the 2012 Badger Open held on - 16 Sep 2012. 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.