This page explains how Joseph S. Helfand (USATT# 6564)'s rating went from 1531 to 1531 at the February Open held on - 25 Feb 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.