This page explains how Martin Bill Guilfoil (USATT# 6303)'s rating went from 1513 to 1513 at the US Olympic Trials held on - 12 Feb 2012. 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.