This page explains how Robert Treitel (USATT# 83210)'s rating went from 1889 to 1866 at the NASHUA TABLE TENNIS CLUB event from 12 Jan 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.