This page explains how Peter Christofolo (USATT# 79607)'s rating went from 1431 to 1426 at the Aurora Winter Open held on - 28 Feb 2010. 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.