This page explains how Petrica (petro) Stirbu (USATT# 30785)'s rating went from 2153 to 2125 at the Atlanta Giant Round Robin held on - 5 Nov 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.