This page explains how Richard A. Dewitt (USATT# 47261)'s rating went from 2170 to 2158 at the 2011 New Hampshire RR Open held on - 30 Oct 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.