This page explains how John Porter (USATT# 27268)'s rating went from 1688 to 1675 at the Central FL Fall Open & FL Cup held on - 28 Oct 2007. 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.