This page explains how Roel Borbon Borbon Aguanta (USATT# 268369)'s rating went from 1952 to 1925 at the 2015 Stiga Portland Open held on - 15 Nov 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.