Originally posted by Ponderable
any more thoughts on this?
Yes, it happens to all of us from time to time and it's not a big deal. So you lose a piece or even a game. So what? Slap yourself in the face, start a new game and carry on.
There's however a very good reason for not having an undo button. I'm sure most people will recognize this: you're looking at a position, wrecking your brain to come up with the best move, finally you have it so you click submit and the moment the screen comes back you see that you've just given your opponent the opportunity to fork your K+Q. That's because you weren't looking at the whole board but only at a small part. And you deserve to be punished for that. Those mistakes determine the difference between a winner and a loser. Having an undo button alters an important aspect of chess.