This page explains how Gideon Teitel (USATT# 75508)'s rating went from 1980 to 1938 at the 2017 Butterfly WDCTT Spet Open & DC Closed held on 23 Sep 2017 - 24 Sep 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.