This page explains how Harrison Glasberg (USATT# 1157583)'s rating went from 1615 to 1558 at the TT&M Friday Night Butterfly League event from 9 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.