This page explains how Carlos Zeller (USATT# 65087)'s rating went from 1690 to 1697 at the Butterfly/PTTC June Open held on - 19 Jun 1999. 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.