This page explains how Deniz Guney (USATT# 220981)'s rating went from 1949 to 1939 at the LYTTC Friday Pro League event from 15 Nov 2019. 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.