This page explains how Daniel Guttman (USATT# 20650)'s rating went from 1257 to 1240 at the NJTTC 2010 October Open held on - 17 Oct 2010. 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.