This page explains how Robert K. Leatherwood (USATT# 7612)'s rating went from 1659 to 1609 at the 2005 Aurora Fall Open Tour held on - 13 Nov 2005. 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.