Snapshot Position

If you get into a tough position with two or more likely choices of moves and you are not sure which to make, select "Snapshot Position" from the Options menu (or press "Control-P").  Then continue playing.  If you discover that you made the wrong choice and want to go back to try something else, select "Undo to Snapshot" from the Options menu (or press "Control-Q).  Pretty Good Solitaire will automatically return you to the position you were at when you selected a snapshot.