This page explains how Ryousuke Adachi (USATT# 33546)'s rating went from 1611 to 1609 at the LATTF event from 19 May 2013. 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.