Update-- will keep 5 stars BUT the learning feature doesnt work, at least on 9 and 13 boards. I can always brat it just by using certain openings and the AI will respond mechanically with the same wrong answers. I am playing in Strong mode. -- Compared to SmartGo Pro, it lacks many features. Who cares? Most of the 1 star ratings are for things Ive never experienced. If you want to play against AI, this apps a gem: clever but simple interface, challenging AI (make sure to use it in strong), no distractions. For a buck your iPhone turns into Go opponent that can create quite a challenge for amateur enthusiast. -- One reviewer dropped 2 stars for lack on a separate volume control. Just use your phone volume control buttons. I think this game is a bit underrated so far. -- Me again...I usually dont rate most apps. But seeing how there are some posts that state it doesnt even work...could you guys try again? It works blissfully for me.