This page explains how Felix Shtorper (USATT# 15550)'s rating went from 1839 to 1878 at the 2015 Valley of the Sun held on 5 Dec 2015 - 6 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.