This page explains how Frank Zandpour (USATT# 51131)'s rating went from 1621 to 1639 at the California Open held on - 1 Sep 2002. 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.