This page explains how Primo O. Madrigal (USATT# 7985)'s rating went from 1889 to 1926 at the US Open Teams Championships held on - 30 Nov 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.