This page explains how Eric R Iosup (USATT# 93553)'s rating went from 257 to 254 at the 2015 Hyson Chicago International Table Tennis Open held on - 9 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.