This page explains how Steve Zhu (USATT# 86510)'s rating went from 1221 to 1217 at the Los Angeles Table Tennis Association event from 18 Aug 2012. 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.