This page explains how Saurabh Gupta (USATT# 74331)'s rating went from 1620 to 1590 at the October Open held on - 27 Oct 2007. 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.