This page explains how Danny Wan (USATT# 219179)'s rating went from 1341 to 1289 at the MDTTC Tuesday/Friday League event from 9 Feb 2018. 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.