This page explains how Xiangfei Zeng (USATT# 219486)'s rating went from 1990 to 1971 at the Spin & Smash Spring Open held on 1 Apr 2023 - 2 Apr 2023. 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.