This page explains how Xun Lin (USATT# 223945)'s rating went from 1803 to 1797 at the BTTC League event from 16 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.