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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 ...
For example, with Axx KQxx Axx KQJ, after partner opens 1D, we respond 1H and partner rebids 1NT, we must bid 4NT quantitative in order to invite slam. Using XYZ, after partner's 1NT rebid, we bid 2C, forcing 2D by partner, and then jump to 3NT, which shows this hand. Thus, we are able to make our slam invitation one level lower.
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).
Because the Kickback bid would otherwise be a control bid, 4NT is usually substituted as the control bid in that suit (e.g., 4NT is a control bid in hearts if the agreed trump suit is diamonds). The drawback is that in unpracticed partnerships there can be confusion as to whether a bid is Kickback, a control bid or preference for a different ...
An opening bid of 2NT shows 20, 21 or 22 HCP. If responder has 13 HCP, then a small slam looks certain (13 + 20 opener's minimum = 33) and should be bid; If responder has 11 or 12 HCP, then a small slam is a possibility but more information is needed about opener's hand before it should be bid. This is where a quantitative bid should be made.
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.
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 Constructed by bridge pioneer Ely Culbertson in the 1940s, they have been superseded by other methods; however, one remaining commonly used asking bid is the 5NT Grand slam force.
South has shown 16-18 total points, while North's hand is largely unknown. North's bid of 4 ♣ is a cue-bid showing first-round control of clubs and an interest in slam. After South's bid of 4 ♦ North bids 4 ♥, an apparent signoff. It may well be that North wants to bid a slam, but has two fast losers in the spade suit.