This page explains how Petrica (petro) Stirbu (USATT# 30785)'s rating went from 2203 to 2153 at the Atlanta Fall Open held on - 10 Sep 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.