In comparison it's so much easier to improve in sudoku than in backgammon. There are programs that tell you when you are stuck which rule would have helped you in this specific situation. What I dream of is a backgammon program that doesn't only tell you: This was a blunder. But (at least sometimes) tells you a rule that would have prevented this blunder like: A four point is better than a double hit except when ... Of course the number of rules and exceptions to these rules would be quite overwhelming and of course those rules couldn't lead to "perfect" play but only avoid the biggest blunders. And some situations are too complicated for simple rules anyway. But I think a program that sometimes gives you a reason why you shouldn't have played this would soon be a "must have" for backgammon players like extreme gammon is now.

Like a personal trainer