This page explains how Nathan A Crabtree (USATT# 95450)'s rating went from 1957 to 1941 at the AZ PTTC Monday event from 11 Feb 2019. 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.