This page explains how Igor Gleyzer (USATT# 21566)'s rating went from 1894 to 1841 at the 2021 September Open @ Princeton Pong held on 11 Sep 2021 - 12 Sep 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.