This page explains how Qing Chai (USATT# 196751)'s rating went from 393 to 380 at the Pong Planet Friday Night, Tuesday Night, And Saturday Leagues event from 29 Sep 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.