Chess Premium HD 4+

It is pretty good. The response time is very fast and it appears to have well debugged software. However, I did came across some
bugs, where it randomly quits (I have seen this happen several times, specially when it is in a lost position and in most cases I have reported the problem). Also many times it would not allow you make a very legitimate move. At that point in time you have to start a new game.

I think this is a nice chess program, it's simple, sound effects are soft and fitting, the music is calming but could get annoying to some and that's no problem because sound can be muted.
I find two things that I think could use improvement; The AI of the computer opponent and stalemates. The comp is a 10x10^ grandmaster at just 50% difficulty, it's as if it literally sees every move and then thinks 100 turns ahead for every possible out come.. Ok, that's an exaggeration, sort of. Turning the AI down to far can cause it to make moves that even a first grader probably wouldn't make. So it can be tough to find the difficulty that's "just right".
The AI I is forgivable because you can play a human, but what I find infinitely frustrating is the conditions in which the game declares a stalemate... Honestly I don't think it should ever be calling a stalemate for the player. Let a human decide when it's time to call a stalemate through the menu button, otherwise it can be very frustrating to be stopped in the middle of a match that may be quite enjoyable and most certainly is not a stalemate. There were certainly legal moves to be made in many of the matches that this premature call was made in, which is very disappointing when it happens.

I'm not an expert player. I'd call myself a middle level player. For me this program offers enough challenge to maintain my interest and it is on my iPad! The graphics are good and for the price it is hard to beat. I have not experienced any of the bugs some have mentioned. The only minor bug is that occasionally a series of games is lost and the game counter starts over. I've never had a problem during a game.