This page explains how Ronald Joseph Arcaro (USATT# 3920)'s rating went from 1536 to 1563 at the Portsmouth Open Invitational held on - 12 Sep 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.