This page explains how Sebastian DeFrancesco (USATT# 38930)'s rating went from 959 to 959 at the ICC CA State Open held on - 5 Jun 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.