This page explains how Harvey Gotliffe (USATT# 6102)'s rating went from 1528 to 1520 at the Butterfly Northern CA Spring O held on - 15 Apr 2007. 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.