This page explains how Olivia Rosin (USATT# 216225)'s rating went from 1171 to 1154 at the HITTA Weekly League event from 19 Nov 2021. 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.