Chess Challengers description
Chess Challengers is a game, which is not meant for learning, but meant for dueling and proving who is better. This app contains many features, which i think will help you a lot. Rules and information is also given while launching the app.
Also after playing the game review it in playstore as well as google forms whose link is provided below.
https://docs.google.com/forms/d/e/1FAIpQLSfnXpd0wtgUv9wzRKos4302oQu7LZpKn9crzGxJZnpsZcuNyw/viewform