This page explains how Dmitry Ryvkin (USATT# 29479)'s rating went from 1981 to 1978 at the Pensacolas 15th Annual Winter Open held on - 17 Jan 2015. 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.