This page explains how Boris Tsang (USATT# 79858)'s rating went from 1830 to 1820 at the 2013 Austin Summer Open Table Tennis Tournament held on - 13 Jul 2013. 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.