This page explains how Peter Boerger (USATT# 43163)'s rating went from 857 to 839 at the Indiana State Championships held on 12 Sep 2020 - 13 Sep 2020. 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.