This page explains how Andrzej Pszczolinski (USATT# 1177594)'s rating went from 1720 to 1665 at the 2023 Flow Chicago Open held on 18 Feb 2023 - 19 Feb 2023. 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.