This page explains how Frank C. Heller (USATT# 6566)'s rating went from 1578 to 1568 at the 1998 Wichita "River City" TTT held on - 10 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.