This page explains how Patrick Keville (USATT# 77971)'s rating went from 1850 to 1849 at the NJTTC Monday League event from 30 Apr 2018. 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.