This page explains how Felix Shtorper (USATT# 15550)'s rating went from 1854 to 1831 at the AZ PTTC Monday event from 11 Apr 2011. 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.