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,
Jump bidding jumps from 0 to 8, the 10-bidder might quit and the 9-bidder will win and pay 8. Some authors claim that jump-bidding reduces the seller's revenue, since the signaling allows bidders to collude and reduce the final price. Therefore, it may be more profitable for the seller to use an auction format that does not allow jump-bidding, such as a Japanese auction. Other authors dispute this claim. Jump bidding In auction theory, jump bidding is the practice of increasing the current price in an English auction, substantially more than the minimal allowed amount. At first glance, jump bidding seems irrational.