This page explains how Charles (Ying) Y. Xiong (USATT# 32947)'s rating went from 1560 to 1555 at the Eastern Open held on - 27 May 2007. 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.