This page explains how Louis R. Alamina (USATT# 20580)'s rating went from 1580 to 1562 at the Waco 2001 Summer RR Tournament held on - 28 Jul 2001. 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.