This page explains how Simon Shtofmakher (USATT# 9997)'s rating went from 2171 to 2158 at the NJTTC Monday League event from 18 Sep 2017. 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.