This page explains how Xun Lin (USATT# 223945)'s rating went from 1817 to 1803 at the BTTC League event from 2 Apr 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.