This page explains how David Y Yoo (USATT# 96977)'s rating went from 890 to 860 at the 2015 HI August Open held on - 16 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.