This page explains how Alvin Yin (USATT# 216020)'s rating went from 1800 to 1791 at the NJTTC Friday League event from 26 Oct 2018. 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.