Serious 3NT Serious 3NT Serious 3NT is a contract bridge bidding convention. It is used in game-forcing auctions where a major suit has been agreed upon. 1–2 if using 2/1 Game Forcing or 2–3 (Agreeing spades) The next bid indicates suitability for slam: Since Spades are the agreed trump suit, Three No Trump is not usually the best contract. Using Serious Three No Trump, a bid of Three No Trump says "I am Serious about slam", i.e. "I have a good hand". Bypassing bidding Three No Trump says "I am not Serious about Slam". Examples shown in the above auction. If one
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.