The app is called “Chess NO ADS” and I like it. Their privacy policy is also great:

“For this reason, as a company, we do not want to have anything to do with the business of collecting and selling personal data.
With this in mind, our privacy policy is extremely simple: this app collects absolutely NO personal information.”

https://www.chesstiger.com/iphone/About_privacy_en.html

Do you have a favourite Chess app for iOS? I fear my dad wants me to do chess riddles and I’m just not good at it.