This page explains how Felix Shtorper (USATT# 15550)'s rating went from 1922 to 1909 at the AZ PTTC Monday event from 26 Jan 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.