This page explains how Olivia Rosin (USATT# 216225)'s rating went from 1140 to 1163 at the HITTA Weekly League event from 5 Dec 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.