This page explains how Tiffany Lam (USATT# 96513)'s rating went from 148 to 122 at the ICC - Sunday Beginners League event from 21 May 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.