This page explains how Sam Latham (USATT# 12974)'s rating went from 1087 to 1086 at the 1999 Irving RR held on - 28 Feb 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.