This page explains how Ken R. Drayton (USATT# 5460)'s rating went from 1218 to 1085 at the NY Open Circuit - Rochester Gi held on - 28 Feb 1999. 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.