This page explains how Daniel Guttman (USATT# 20650)'s rating went from 1564 to 1559 at the NJTTC Monday League event from 28 Dec 2015. 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.