This page explains how Kodi Vonderau (USATT# 77003)'s rating went from 1443 to 1421 at the Philly Open Tournament held on - 15 Feb 2015. 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.