This page explains how Jim Weisbecker (USATT# 28820)'s rating went from 1383 to 1630 at the Huntsman World Senior Games held on - 8 Oct 2009. 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.