This page explains how Preston Ha Trun Ha Nguyen (USATT# 29200)'s rating went from 2311 to 2287 at the OCTTA- JULY 2019 OPEN held on 20 Jul 2019 - 21 Jul 2019. 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.