This page explains how Charles O Olisa (USATT# 97816)'s rating went from 1946 to 1990 at the San Antonio TTC League event from 9 Sep 2019. 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.