This page explains how Tom Ruan (USATT# 14167)'s rating went from 1947 to 1943 at the ICC California State Open held on - 27 May 2012. 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.