This page explains how Steven Claflin (USATT# 18138)'s rating went from 1978 to 1971 at the San Antonio Winter Open held on - 22 Feb 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.