This page explains how Nobuyuki Shiogai (USATT# 26208)'s rating went from 1921 to 1981 at the 2004 N. American Teams Open TT held on - 28 Nov 2004. 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.