This page explains how Mark E. Berg (USATT# 6250)'s rating went from 1888 to 1837 at the Potomac 2007 Spring Open held on - 13 May 2007. 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.