This page explains how Charnchai Tangpong (USATT# 4402)'s rating went from 1915 to 1939 at the St. Louis Gateway Open held on - 4 Jun 1995. 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.