This page explains how Bill Draper (USATT# 215512)'s rating went from 1286 to 1262 at the MDTTC Tuesday/Friday League event from 28 Nov 2017. 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.