This page explains how Donald C. Hayden (USATT# 51994)'s rating went from 1610 to 1555 at the MI-MARCH OPEN held on - 24 Mar 2001. 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.