This page explains how Ryan Wing H H Yam (USATT# 76360)'s rating went from 908 to 906 at the Sacramento Winter Open held on - 14 Mar 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.