This page explains how Frank Zandpour (USATT# 51131)'s rating went from 1789 to 1758 at the US Open held on - 6 Jul 2013. 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.