This page explains how David Feerst (USATT# 77511)'s rating went from 1637 to 1624 at the 2011 Badger Open held on - 18 Sep 2011. 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.