This page explains how Thelma Tybie Sommer (USATT# 10155)'s rating went from 1371 to 1368 at the Huntsman World Senior Games held on - 18 Oct 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.