This page explains how Antonio Mattos (USATT# 1892)'s rating went from 1641 to 1623 at the Sam Lima Labor Day Tournament held on - 3 Sep 1995. 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.