This page explains how Pinchung Chen (USATT# 89620)'s rating went from 2254 to 2223 at the ICC STIGA California Open held on - 6 Dec 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.