This page explains how David K. Chwa (USATT# 19817)'s rating went from 1901 to 1861 at the LATTF event from 29 Sep 2013. 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.