For the first class use words and wait to introduce notation after set notation has been reviewed in the probability section of the class. Player's assume all players try to maximize their payoffs. Note the is doesn't rule out modeling altruism. Country must decide whether to launch with no knowledge whether the other side has launched. Then each player draws a card and without looking at it puts it on his forehead so that the other player can see the card.
Bidding starts with one of the players.
Players can fold, raise, stay or call. Play continues until a fold or call. If a player folds they forfeit the pot to the opposing player. If they call then the highest of the two cards takes the pot. If it is a tie the pot remains for the next deal.