This page explains how Donald Feltenberger (USATT# 55196)'s rating went from 1821 to 1812 at the Westchester 2012 September Open held on - 30 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.