This page explains how Jon Hiratsuka (USATT# 49174)'s rating went from 1422 to 1417 at the 1999 Potomac Fall Open held on - 21 Nov 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.