This page explains how Andrew Nguyen (USATT# 93182)'s rating went from 1393 to 1387 at the OC Magic Spin Open held on - 7 Dec 2014. 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.