Not bad, to be frank. Apart from the way too fast movement of pieces, the lack of hints (you have to pay for that! Why, can I not change to AI's Chess?), but worst of all, the intrusive ads! Annoyng, not to mention security questions. I eliminate internet access before starting the game to be safe. So annoying that I am thinking of uninstalling. A pity for an app that could have a better future, were it not that intrusive, that feels unsafe.