The negative double is a form of takeout double in bridge. It is made by the responder after their right-hand opponent overcalls on the first round of bidding, and is used to show shortness in overcall's suit, support for the unbid suits with emphasis on majors, as well as some values. It is treated as forcing, but not unconditionally so. In practice, the negative double is sometimes used as a sort of catch-all, made when no other call properly describes responder's hand. Therefore, a partnership might even treat the negative double as a wide-ranging call that merely shows some values.
Using the modern negative double convention, it is understood that a double over an initial overcall is conventional, and not for penalties (but see Playing for penalties). For example, using this convention, the following doubles would be regarded as negative, not for penalty:
In understandings regarding negative doubles, the emphasis is on major suit lengths. This is largely due to the special value that tournament play, especially the pairs game, places on major suits. Since the mid-1980s, the negative double has been used mainly to stand in for a bid in an unbid major suit.
Most partnerships using the negative double agree that it applies only through a particular level of overcall. For example, they may agree that the double of an overcall through 3♠ is negative, and that beyond 3♠ a double is for penalties.
At rubber bridge many players are reluctant to give up the penalty double of an overcall, and so do not use the double as conventional.
The term negative double was initially employed to distinguish it from the penalty, or business, or positive double, and signified a double over an opponent's opening bid whose meaning was a request for partner to bid his best suit. Around 1930, the term informatory double replaced negative double, and that term later gave way to takeout double as it is used at present; the original term negative double fell into disuse.
In 1957, Alvin Roth in his partnership with Tobias Stone appropriated the abandoned term negative double to denote a conventional double by responder over an overcall and gave it its current meaning. [1] The bid was also briefly known as Sputnik, because it was as new as the satellite of that name that the Soviet Union had recently launched. The term is still used sometimes in Europe. [1]
The negative double is generally forcing, but opener might pass to convert the double to a penalty double. There is a special agreement called negative free bids, under which (after the overcall) the bid of a new suit by responder is not forcing. However, most negative doublers play that a new suit response (or free bid), whether at the one level or higher, is forcing.
The negative double loses even more definition when it can be made with a very broad range of strength, from roughly six HCP up to game forcing values. In a pinch, players use it to "get by this round of bidding."
The negative double does not cause the partnership to completely lose the ability to penalize an overcall. There are two ways that the overcall can be doubled for penalties. For example:
Responder makes a negative double, and opener passes for penalties. This position is analogous to one in which a player makes a takeout double and his partner passes the double, converting it to a penalty double.
Responder passes the overcall, opener makes a re-opening double, and responder passes that double for penalties. This can be dangerous, because opener often doesn't know whether responder is simply too weak to make any call, or is hoping that opener can re-open with a double.
These situations are rare, though, and the more so because some five-card major partnerships play negative doubles over minor suit openings only. The rationale is that responder knows much more about opener's distribution after a major suit opening than after a minor suit opening, and can better judge whether to play in opener's major suit, to play for penalties by doubling, or to show a suit of his own.
Partnerships have different understandings about the length in unbid suits that is shown by a negative double, and the understandings differ according both to which suits remain unbid and to the current level of the bidding. Nevertheless, the following are popular understandings:
Acol is the bridge bidding system that, according to The Official Encyclopedia of Bridge, is "standard in British tournament play and widely used in other parts of the world". It is a natural system using four-card majors and, most commonly, a weak no trump.
Polish Club is a bridge bidding system which was developed in Poland, where it is the most popular bidding system, and which is also used by players of other countries. It is a type of small club system.
The Michaels cuebid is a conventional bid used in the card game contract bridge. First devised by Michael Michaels of Miami Beach, FL, it is an overcaller's cuebid in opponent's opening suit and is normally used to show a two-suited hand with at least five cards in each suit and eight or more points.
Preempt is a bid in contract bridge whose primary objectives are (1) to thwart opponents' ability to bid to their best contract, with some safety, and (2) to fully describe one's hand to one's partner in a single bid. A preemptive bid is usually made by jumping, i.e. skipping one or more bidding levels. Since it deprives the opponents of the bidding space, it is expected that they will either find a wrong contract of their own, or fail to find any. A preemptive bid often has the aim of a save, where a partnership bids a contract knowing it cannot be made, but assumes that, the penalty will still be smaller than the value of opponents' bid and made contract.
These terms are used in contract bridge, using duplicate or rubber scoring. Some of them are also used in whist, bid whist, the obsolete game auction bridge, and other trick-taking games. This glossary supplements the Glossary of card game terms.
In the card game contract bridge, a takeout double is a low-level conventional call of "Double" over an opponent's bid as a request for partner to bid his best of the unbid suits. The most common takeout double is after an opponent's opening bid of one of a suit where the double shows a hand with opening values, support for all three unbid suits and shortness in the suit doubled. Normally, the partner of the doubler must bid his best suit but may pass if (a) his right hand opponent intervenes or (b) on the more rare occasions when his hand is such that he wishes to convert the takeout double to a penalty double.
Lebensohl is a contract bridge convention whose variants can be used in the following situations:
Negative free bid is a contract bridge treatment whereby a free bid by responder over an opponent's overcall shows a long suit in a weak hand and is not forcing. This is in contrast with standard treatment, where a free bid can show unlimited values and is unconditionally forcing. The treatment is a relatively recent invention, and has become quite popular, especially in expert circles.
Rubinsohl is a bridge convention that can be used to counter an opponent's intervention over a 1NT opening bid. After opponent's two-level overcall, all bids starting from 2NT are transfer bids to the next strain.
The Raptor 1NT overcall over an opposing 1-level suit opening is a contract bridge convention that indicates a two-suited hand with exactly four cards in the unbid major and a longer suit in an unbid minor.
In the game of bridge, Ghestem is a conventional overcall structure, using 2NT, 3♣, and the (non-jump) cuebid over an opposing opening at the one level to denote two-suited hands in two of the remaining three suits.
In contract bridge, a 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.
In the card game bridge, a forcing pass is an agreement or understanding that a pass call obliges the partner to bid, double, or redouble over an intermediate opposing pass, i.e. partner must "keep the bidding open".
EHAA is a highly natural bidding system in contract bridge characterized by four-card majors, sound opening bids, undisciplined weak two-bids in all four suits and a mini notrump, usually of 10–12 high card points.
Inverted minors refers to a treatment introduced by the Kaplan–Sheinwold (K–S) bidding system for the popular card game bridge. The original structure of Precision, another bidding system, also employed inverted minors over a 1♦ opening. However, the treatment is no longer restricted to users of these bidding systems. although partnerships that use a Short club system tend also to use the convention only after a 1♦ opener.
The support double is a bridge convention used to distinguish between three-card and four-card support for partner's suit response to one's opening bid in the scenario where his response is either overcalled or doubled by the opponents. A call of two in partner's suit indicates four-card support and a call of double promises three-card support; if partner's suit bid is doubled instead of overcalled, a redouble serves the same meaning as double. The convention was invented by Eric Rodwell in 1974.
In the card game bridge, CoCa or Comfy Canapé is a conventional defense against opposing 1NT openings. When playing CoCa, over a 1NT opening of the opponents, both a double as well as a 2♣ overcall are conventional and establish spades and hearts, respectively as anchor suits. Higher overcalls can be either natural, or conventional.
Unusual vs. unusual is a competitive bidding convention used in contract bridge by the opening side after an opponent has made an overcall showing two suits.
Astro is a contract bridge bidding convention used to intervene over an opponent's one notrump (1NT) opening bid. The name is derived from the initials of the surnames of its inventors - Paul Allinger, Roger Stern and Lawrence Rosler.
Five-card majors is a contract bridge bidding treatment common to many modern bidding systems. Its basic tenet is that an opening bid of one-of-a-major in first and second position guarantees at least five cards in that major. This method has become standard in North American tournament play, but European methods vary.