This page explains how John Romoa (USATT# 13572)'s rating went from 1265 to 1218 at the Hawaii Island Open 2009 held on - 8 Nov 2009. 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.