I'm reading the rules, and I found the section on Diplomacy to be a little vague. Do I announce how many Diplomacy cards I am using before or after I roll?
For example, I might be holding three diplomacy cards of a certain type but roll well enough that I only need two. Did I have to commit a certain number of cards before rolling? The rules don't quite say when you play the cards (only that you discard the ones you do play).