This page explains how Vladimir Rosenbaum (USATT# 84449)'s rating went from 1254 to 1215 at the Windy City Open held on 13 May 2017 - 13 May 2017. 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.