This page explains how Peter J. Sahaidachny (USATT# 28445)'s rating went from 1191 to 1185 at the Lagunitas Table Tennis Club event from 8 Oct 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.