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In the card game "contract bridge", a splinter bid is a convention whereby a double jump response in a side-suit indicates excellent support (at least four cards), a singleton or void in that side-suit (but preferably not the ace or king), and at least game-going strength. [1]
Jacoby 2NT (Swedish: Stenberg 2NT) is a bridge convention in which a bid of 2NT over partner's opening bid of one heart (1 ♥) or one spade (1 ♠) shows a hand with both opening strength or better - normally at least 12 HCP or a hand meeting the " Rule of 20 " criteria, and
Splinters are used early in the bidding to communicate a strong hand, with a fit for partner's last bid suit and a side-suit singleton or void. The splinter bid is a double jump shift to the singleton or void suit. Partner of the splinter bidder will then typically bid game or proceed with cue-bids to investigate the possibility of a slam.
This is a list of bidding systems used in contract bridge. [1] [2] Systems listed have either had an historical impact on the development of bidding in the game or have been or are currently being used at the national or international levels of competition. Bidding systems are characterized as belonging to one of two broadly defined categories:
Bridge conventions can be classified according to their purpose: Opening bid conventions. Strong opening bids are used for hands stronger than the "normal" opening bid range (12-20 points in natural systems, 12-15/17 points in artificial systems) Strong two clubs in natural systems denote hands of 22+ high card points; Benjamin Twos in natural ...
With the other suit and less than game interest responder bids their suit; A jump cuebid is a splinter bid in the bid suit; With a 10+ card major fit (e.g. 5+ playing five-card majors) with opener and less than game values responder bids the major at the four level [6]
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 the card game of bridge, the unusual notrump [1] is a conventional overcall showing a two-suited hand. It was originally devised by Al Roth in 1948 with Tobias Stone, [2] to show the minor suits after the opponents opened in a major.