This page explains how Sean Koster (USATT# 212045)'s rating went from 1644 to 1672 at the 2019 Arizona Closed (AZ State Championship) held on 18 May 2019 - 19 May 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.