This page explains how Mitchell Seidenfeld (USATT# 9877)'s rating went from 2121 to 2123 at the Minnesota State Championships held on - 25 Jan 2009. 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.