This page explains how J. (Gene) Eugene Wilson (USATT# 11153)'s rating went from 1297 to 1230 at the US Nationals held on - 21 Dec 1997. 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.