This page explains how C. Evan Oswald (USATT# 59885)'s rating went from 1226 to 1211 at the AZ PTTC Wednesday event from 18 Aug 2010. 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.