This page explains how Xun Lin (USATT# 223945)'s rating went from 1820 to 1848 at the BTTC League event from 12 Nov 2019. 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.