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
Japanese auction Japanese auction A Japanese auction (also called ascending clock auction) is a dynamic auction format. It proceeds in the following way. Suppose a buyer believes that the value of the item is "v". Then this buyer has a simple dominant strategy: stay in the arena as long as the displayed price is below "v"; exit the arena whenever the displayed price equals "v". This means that the Japanese auction is a truthful mechanism: it is always best to act according to your true value, regardless of the others' values. When all buyers play their dominant strategies, the outcome is: A