This page explains how Robert (Bobby) Ryberg (USATT# 43623)'s rating went from 1388 to 1356 at the AZ PTTC Monday event from 4 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.