This page explains how Jon Blauvelt (USATT# 278956)'s rating went from 589 to 587 at the AZ PTTC Monday event from 6 Nov 2023. 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.