This page explains how William H. Durbin (USATT# 17486)'s rating went from 1395 to 1280 at the Mid-Florida Tour-Lakeland July Classic held on - 17 Jul 2010. 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.