This page explains how Ericson Calderon (USATT# 229699)'s rating went from 857 to 810 at the South Bay Fall / Winter Singles League 2018 event from 18 Jan 2019. 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.