This page explains how Utako Kase (USATT# 223100)'s rating went from 1580 to 1550 at the Spttc Saturday Night League event from 31 Aug 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.