Just a small suggestion to improve site usability. It would be nice if «Estimate score» was implemented on top of current game mode instead of a separate mode, so game tree view would not disappear when «Estimate score» was clicked and you can view current fork and turn number in same time as estimated score.
Also it would be good if «Estimate score» tool could be switched to use area or territory+prisoner counting regardless of current game rule settings. Or the tool can always show both estimates whenever they happen to be different?