This page explains how Christos Dousmanis (USATT# 77153)'s rating went from 1670 to 1646 at the Schaumburg Spring Open held on - 8 May 2010. 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.