This page explains how Allen McDermott (USATT# 8199)'s rating went from 1872 to 1889 at the A-B-Q 32 held on - 13 Nov 2004. 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.