Once the leader of a trick has played a card, everyone else must "follow suit" (play a card of that same suit, if they have one). If the first card played in a trick is the Fool, the required suit to follow is determined by the following card. If a player cannot follow suit, he must play a trump card if able, and additionally, the player is compelled to play a higher trump than any existing trump in the trick if he is able (The "Petit" or 1 is valued lowest, and the "Monde" or 21 is valued highest). If a player must trump but cannot overtrump, they can play any trump. If a player cannot follow suit or trump, he may play any card to the trick, however any card they play in such a situation cannot win the trick.