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Slam-seeking conventions are codified artificial bids used in the card game contract bridge. Bidding and making a small slam (12 tricks) or grand slam (13 tricks) yields high bonuses ranging from 500 to 1500 points. However, the risk is also high as failure to fulfill the slam contract also means failure to score the bonus points for a game ...
The Norman scale, where an ace counts as one control and a king as half a control, is the basis of the following responses to the 4NT asking bid: 5 ♣: 0 to 1 controls indicating either (a) no aces or kings, or (b) one or two [citation needed] kings or (c) one ace 5 ♦: 1½ controls indicating either (a) one ace and one king or (b) three kings
A bid of five notrump shows either: Any two aces, or; One ace, and the kings of all suits previously bid by either partner. A bid of a new suit shows first-round control (ace or void) there, but is not compulsory with such a holding. Six of a previously bid suit shows a desire to play there (holding one ace, or the kings of all bid suits).
In contract bridge, a cue bid (also, cuebid or cue-bid) is either a bid of the opponents' suit, or "slam seeking": a slam-investigating bid made during an auction's later rounds that shows control of a suit. Traditionally a cue bid is "slam seeking", but in the early 21st century the usage appears to be giving way to control bid.
In contract bridge, an asking bid is a convention used to seek a slam accurately. There are two types - suit asking bids and notrump asking bids. Constructed by bridge pioneer Ely Culbertson in the 1940s, they have been superseded by other methods; however, one remaining commonly used asking bid is the 5NT Grand slam force.
1 ♥ - 3 ♥ 4 ♣ - 4 ♦. The 4 ♣ bid shows a club control and slam interest. If the partnership has agreed to use Last Train, the 4 ♦ bid indicates extra values (i.e., responder's hand is at the upper end of the strength range indicated by the 3 ♥ bid) and invites partner to continue exploring slam. 4 ♦ does not show a diamond control, although of course responder might have one.
See control bid. Partnership agreements indicate when in an uncontested auction a bid is considered a cuebid. Usually used in exploring for a slam contract (see Bridge conventions (slam seeking)), or for showing stoppers needed for a notrump game. Culbertson four-five notrump
After a 1NT opening, a 2 ♠ response asks opener whether he is minimum or maximum for his bid. Opener responds 2NT with a minimum or at the three-level in his lowest four-card suit with a maximum. Responder may have one of two ranges: 11-12 points (looking for game in notrump) or 17-20 points (looking for slam in notrump or a minor suit).