This page explains how David Yifeng Xu (USATT# 1174699)'s rating went from n/a to 1555 at the 2022 US National TT Championships Washington State Qualifier held on 9 Apr 2022 - 10 Apr 2022. 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.