This page explains how Petrica (petro) Stirbu (USATT# 30785)'s rating went from 1893 to 1978 at the Atlanta Giant RR held on - 11 Mar 2006. 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.