This page explains how Johnnie Emanuel Jose Lopez Arteaga (USATT# 4861)'s rating went from 1980 to 1971 at the HITTA Weekly League event from 21 Nov 2021. 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.