This page explains how Ian Seidenfeld (USATT# 80503)'s rating went from 1054 to 1025 at the Bloomington Armory Community League event from 1 Oct 2012. 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.