This page explains how Daniel Guttman (USATT# 20650)'s rating went from 494 to 493 at the NJTTC February Open held on - 20 Feb 2000. 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.