This page explains how David Rosenzweig (USATT# 55035)'s rating went from 2121 to 2213 at the Westfield September Open held on - 13 Sep 1998. 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.