This page explains how Johnny Yam (USATT# 74934)'s rating went from 1658 to 1652 at the Concord Cup Youth Open held on - 26 Oct 2008. 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.