This page explains how Sasha Parfenov (USATT# 79070)'s rating went from 1656 to 1639 at the Golden State Open held on - 29 May 2011. 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.