This page explains how Daniel Guttman (USATT# 20650)'s rating went from 980 to 970 at the NJTTC Monday League event from 18 Sep 2006. 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.