This page explains how Larry Portugal (USATT# 16058)'s rating went from 1390 to 1362 at the San Diego 40th Anniversary Ope held on - 3 Oct 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.