This page explains how David Contraras Guevara (USATT# 28139)'s rating went from n/a to 1500 at the Boston TTC event from 9 Jun 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.