This page explains how Albert Dosamantes (USATT# 90955)'s rating went from 1231 to 1230 at the Austin Table Tennis League event from 30 Nov 2012. 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.