This page explains how Mark J. Hoffman (USATT# 24438)'s rating went from 1518 to 1491 at the Vernon Hills Summer Open 1 Star held on - 25 Aug 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.