This page explains how Alvin Yin (USATT# 216020)'s rating went from 1807 to 1806 at the NJTTC Friday League event from 11 Jan 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.