This page explains how John Porter (USATT# 27268)'s rating went from 1659 to 1638 at the Florida Orange Blossom TT Tour held on - 19 Jul 2008. 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.