This page explains how Maria Dalee (USATT# 230607)'s rating went from 870 to 889 at the AZ PTTC Monday event from 21 Oct 2020. 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.