This page explains how Chi W. Lam (USATT# 61680)'s rating went from 1920 to 1855 at the 2016 Cedar Rapids Inaugural Open held on 20 Aug 2016 - 21 Aug 2016. 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.