This page explains how Patrick Keville (USATT# 77971)'s rating went from 1856 to 1807 at the LYTTC Friday Pro League event from 28 Jul 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.