This page explains how Lanfei Chen (USATT# 197032)'s rating went from 1492 to 1488 at the Roslyn-Long Island Sports Center (LISC) League event from 8 Feb 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.