This page explains how Sean Koster (USATT# 212045)'s rating went from 1879 to 1840 at the 2022 TT&M's Turkey Butterfly Open held on 18 Nov 2022 - 20 Nov 2022. 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.