This page explains how JIM TARKOWSKI (USATT# 10476)'s rating went from 1964 to 1940 at the AZ PTTC Monday event from 12 Feb 2013. 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.