This page explains how William D Pollan (USATT# 9143)'s rating went from 1342 to 1333 at the AITTA League Singles held on - 12 May 2001. 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.