This page explains how Ian Seidenfeld (USATT# 80503)'s rating went from 1438 to 1430 at the Bloomington Competition and Elite League event from 23 Oct 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.