This page explains how Basil C Ibegbu (USATT# 74880)'s rating went from 1946 to 1990 at the Aurora Winter Open held on - 28 Feb 2010. 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.