This page explains how Ian Seidenfeld (USATT# 80503)'s rating went from 1062 to 1027 at the Minnesota Saturday Open event from 13 Apr 2013. 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.