This page explains how Marvin A. Leff (USATT# 7671)'s rating went from 2051 to 2048 at the Orlando Winter Open held on - 30 Jan 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.