This page explains how Marco J. Borrillo (USATT# 59455)'s rating went from 1691 to 1681 at the TT&M Fall Open held on - 24 Oct 1999. 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.