This page explains how Jerome Perlmutter (USATT# 47385)'s rating went from 1680 to 1640 at the Orlando Winter Open held on - 4 Feb 1996. 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.