This page explains how Chi W. Lam (USATT# 61680)'s rating went from 1847 to 1870 at the 2017 Butterfly Badger Open held on 15 Sep 2017 - 17 Sep 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.