This page explains how Frank C. Heller (USATT# 6566)'s rating went from 1556 to 1541 at the 1997 Wichita River Festival TT held on - 10 May 1997. 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.