This page explains how Leon Li (USATT# 14682)'s rating went from 1521 to 1639 at the Schaumburg $1100 RR Open held on - 16 Jan 1999. 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.