I've seen this complaint about Excalibur's chess products online, after I experienced it myself. In my case, the H8 square was not working. So everytime a King side castling move needed to be done, the computer would not let me proceed. For those of you who are looking to buy this, the chess computer requires you to press (either the piece or your finger) on the starting square and the destination square, when a move is made. So when I say that a square does not work, I mean that the computer does not recognize a press on that square.
I returned mine. DB Roth was kind enough to give me a refund even though I had passed the return date. Amazon paid for half of the cost to ship it back to them. So, I can't say I was very unhappy with the return process.
Advice to future buyers of this product. Don't buy it. I was lucky that I found this problem on a square that is frequently moved from. It is quite possible that other sets would have problems on squares where moves are not made that often. You would not want to catch that after 3-4 months of owning the board, especially, if you are buying this to play casually once in a while.
In my case, I bought this for my son to learn. After this experience, I decided to buy a more expensive chess computer - the Novag Aquamarine through Amazon. I will write a review of it once I receive it. I found one user having a similar complaint about one of the inexpensive chess computers from Saitech as well, and so I got cautious, and stayed away from them as well. The Novag Aquamarine does not have a single user review. I hope I am luckier this time. I say that because I have even seen a good review of one these chess computers say that they loved it even though the presses on the squares stopped working after the first two weeks. I'm sure I wouldn't love that. In the end, it looks like getting any of these chess computers is a bit of a gamble.
I also considered buying an autosensory board, but decided against it. There is only one I could find, called the Novag Citrine that is $150 and is not available on Amazon. Although I have not seen any major complaints about it, I decided against buying it. These autosensory boards do not require presses, because the pieces have magnets and I suppose the square are able to pick up the magnets. This means there is more than one thing that can go wrong with these boards. In addition to a square going bad, it is possible that a magnet could fall off a piece or could lose it's magnetization.
My main reasons for buying a chess computer :-
1. Keep my son away from using a computer for chess - keep him from straining his eyes. He already watches too much TV IMHO.
2. I'm not good at chess, I would like him to learn and grow up playing a worthy opponent from the get go.
3. He doesn't have to depend on me or my wife to be able to play chess. When he's with his friends, they don't really want to play chess.