This page explains how Charles O Olisa (USATT# 97816)'s rating went from 1937 to 1935 at the 2021 Alamo City Open held on 27 Feb 2021 - 28 Feb 2021. 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.