This page explains how Donald B. Hayes (USATT# 50664)'s rating went from 1991 to 1996 at the Ralph Robinson Mem Tri-State O held on - 25 Jan 1997. 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.