This page explains how Tiffany Lam (USATT# 96513)'s rating went from 91 to 83 at the PTTC Saturday League event from 20 Dec 2014. 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.