Deal, Gentlemen Collectionneurs

You are playing the roles of millionaires who collect mysterious artefacts from the four corners of the earth. Apparently, when collected in threes, these objects have amazing powers. Auctions bore you, so instead you and your rivals have to agree on how to divvy up each load of artefacts. In each round, three objects must be divided up between two players. Each person takes what he or she wishes – if the other person agrees! Is it a deal? In each round (or Deal), place 3 artefact cards in the middle of the table: 2 face up and 1 face down. Two players must agree on how to divide up these 3 cards. Attention: all the cards must go somewhere; none can be set aside. Cards from previous rounds cannot be exchanged. Negotiations are free and open. They end as soon as both players accept a proposal and say, “DEAL!” Once an agreement has been reached, the 2 players each take their share and place it behind their own screens. The player who has obtained the face-down card can look at it (secretly or openly) and put it with his or her other cards. The game ends with there are no more cards in the stack.