This page explains how Keito Hosokawa (USATT# 217875)'s rating went from 1245 to 1240 at the South Bay Spring/Summer Singles League event from 15 Jun 2018. 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.