This page explains how John R. R. Miller (USATT# 18162)'s rating went from 1255 to 1215 at the 2019 MDTTC August Open held on 10 Aug 2019 - 11 Aug 2019. 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.