Sarah's hand's pretty boring in this two player game: Copper, copper, copper, silver, estate. She plays her money and buys a duchy. Her score goes up. What's the most it can go up? What's the least?
My answers (no explanation under spoilers, just numbers - better answers may be possible):
Least: Sarah can lose as many as seven points by buying that duchy.
Most: Sarah can gain at least forty eight points by buying that duchy.