Konter a Matt jack 1, 10 and 9 nothing. At the beginning of one game, the trump suit is fixed. Additionally, three cards are always trumps: the queens of spades Q, hearts Q and diamonds Q are always trumps. This is what gave the name to the game: the two queens of hearts Q and diamonds Q are the two Kontra trumps, the queen of spades Q is the “Matt”. As a consequence, in a match, depending on which suit is the trump, there are nine or eight trumps, four possibilities, the value of the cards is as follows (from highest to lowest,
Vickrey auction payment in the sealed second-price auction. Vickrey considered the case of two buyers and assumed that each buyer's value was an independent draw from a uniform distribution with support formula_15. With buyers bidding according to their dominant strategies, a buyer with valuation formula_12 wins if his opponent's value formula_17. Suppose that formula_12 is the high value. Then the winning payment is uniformly distributed on the interval formula_19 and so the expected payment of the winner is We now argue that in the sealed first price auction the equilibrium bid of a buyer with valuation formula_12 is That is, the payment