This page explains how John Oros (USATT# 53699)'s rating went from 1641 to 1639 at the Mother's Day Open held on - 11 May 1996. 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.