This page explains how John Karp (USATT# 15756)'s rating went from 1627 to 1638 at the Club Joola Marietta Fall Open held on - 13 Oct 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.