I&#x27;ve been using chesscademy.com for like a year or more, they have excellent chess strategy puzzles. Problem is however that site has some annoying little bugs on touch devices that I&#x27;ve reported a few times and got zero response from owner, and AFAIK they still haven&#x27;t fixed them. Also I&#x27;ve noticed that some puzzles started repeating quite often, which all led me to conclusion that this project has been abandoned?!