This page explains how John S. Weaver (USATT# 10961)'s rating went from 1512 to 1491 at the Potomac Fall Open held on - 19 Nov 1995. 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.