This page explains how Samuel D. Matossian (USATT# 26319)'s rating went from 1672 to 1666 at the Pacific Coast Open held on - 26 Aug 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.