This page explains how Jiadong Xu (USATT# 281738)'s rating went from 1950 to 1942 at the Hot Shot League event from 21 Jan 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.