This page explains how Felix Shtorper (USATT# 15550)'s rating went from 1860 to 1858 at the AZ PTTC Monday event from 11 Jun 2012. 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.