This page explains how Pradyumna Amatya (USATT# 82229)'s rating went from 1869 to 1830 at the ICC STIGA California Open held on - 6 Dec 2015. 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.