This page explains how Mark Brouda (USATT# 27868)'s rating went from 1589 to 1583 at the Brooklyn TTC February Open held on - 1 Feb 2009. 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.