This page explains how Roger Paul Haidvogel (USATT# 6361)'s rating went from 1801 to 1791 at the 2019 Pauli Orr Memorial Tournament held on 27 Sep 2019 - 28 Sep 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.