This page explains how Thomas Mohn (USATT# 16479)'s rating went from 1617 to 1615 at the Pottsgrove TTC event from 17 Mar 2006. 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.