This page explains how Wally Lien (USATT# 7766)'s rating went from 1265 to 1272 at the Portland Double RR held on - 2 May 1998. 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.