Lozza User Interfaces
This is a sister project to my Javascript chess engine Lozza - https://github.com/op12no2/lozza - providing example web interfaces.
You can try them here - https://op12no2.github.io/lozza-ui
They are designed to be mobile-friendly. There is no app for the user interfaces but you can add screen link so that they are one click away.
The mate-in-one game sounds easy, but it's often hard to see the mate quickly.
Acknowledgements
https://github.com/oakmac/chessboardjs
https://github.com/jhlywa/chess.js
https://github.com/davidbau/seedrandom
https://github.com/jquery/jquery