This page explains how Al Marshall (USATT# 61195)'s rating went from 1428 to 1417 at the 1998 Waco Summer RR held on - 15 Aug 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.