This page explains how Ying Liu (USATT# 90293)'s rating went from 1643 to 1639 at the 2015 Decatur Open held on - 15 Aug 2015. 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.