I am giving this game 3 stars, not because it is bad, but right off the bat, the game brings out the "master" part. Not sure what strength means, since no matter what it seems to whoop me. Anyway, before you play, heavily look into the options menu, unless you are bobby Fischer, of course. Note: it worked fine until I went into the options, then crashed constantly. Last the pieces are hard to tell apart, at least in marble, didn't get to check the others.