This page explains how Lisa Modlich (USATT# 60992)'s rating went from 1649 to 1638 at the Friends of Ping Pong held on - 11 Dec 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.