This page explains how Jonathan Qin (USATT# 92665)'s rating went from 1863 to 1853 at the AZ PTTC Monday event from 10 Aug 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.