This page explains how Xiaoping Zhu (USATT# 215951)'s rating went from 1939 to 1886 at the LYTTC Friday Pro League event from 10 Mar 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.