This page explains how Larry Portugal (USATT# 16058)'s rating went from 1341 to 1363 at the Sun City Open Senior TTT held on - 1 May 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.