This page explains how Jozef Simkovic (USATT# 80797)'s rating went from 1631 to 1610 at the 2017 Butterfly WDCTT December Open held on 9 Dec 2017 - 10 Dec 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.