This page explains how Tom Lackaff (USATT# 4387)'s rating went from 1906 to 1874 at the NJTTC Monday League event from 29 Jan 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.