This page explains how Eric Purwaka (USATT# 926315)'s rating went from 1130 to 1121 at the Austin Table Tennis League event from 27 Dec 2017. 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.