This page explains how John C Browning (USATT# 50538)'s rating went from 1647 to 1670 at the 1997 Happy Holidays TTT held on - 6 Dec 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.