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Fourth suit forcing (also referred to as fourth suit artificial; abbreviated as FSF or 4SF) is a contract bridge convention that allows responder to create, at his second turn to bid, a forcing auction. A bid by responder in the fourth suit, the only remaining unbid suit, is artificial indicating that responder has no appropriate alternate bid, remains interested in the potential for a game contract and asks opener to bid again to show additional features. Opener responds to the fourth suit forcing by (in prioritised order): Corollary to fourth suit forcing Fourth suit by a passed hand

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  • Fourth suit forcing (en)
  • Vierde kleur forcerend bod (nl)
  • Czwarty kolor (pl)
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  • Czwarty kolor – brydżowa konwencja licytacyjna autorstwa Normana Squire'a, jedna z najpopularniejszych i najbardziej znanych współczesnych konwencji. Typowa sekwencja czwartego koloru to rebid przez odpowiadającego w drugim okrążeniu licytacji nowego, jeszcze nie licytowanego koloru - w powyższym przykładzie 2♥. Czwarty kolor jest odzywką sztuczną i forsującą, zazwyczaj pokazuje brak zatrzymania w zalicytowanym kolorze i prosi partnera o dalszy opis jego ręki. Spotykanych jest wiele ustaleń dotyczących tego jak forsujący jest czwarty kolor (na jedno okrążenie, do końcówki) oraz używane są różne schematy odpowiedzi z zależności od używanego systemu licytacyjnego. (pl)
  • Fourth suit forcing (also referred to as fourth suit artificial; abbreviated as FSF or 4SF) is a contract bridge convention that allows responder to create, at his second turn to bid, a forcing auction. A bid by responder in the fourth suit, the only remaining unbid suit, is artificial indicating that responder has no appropriate alternate bid, remains interested in the potential for a game contract and asks opener to bid again to show additional features. Opener responds to the fourth suit forcing by (in prioritised order): Corollary to fourth suit forcing Fourth suit by a passed hand (en)
  • In het kaartspel bridge kunnen de speelpartners een conventionele afspraak maken over een vierde kleur forcerend bod. Dit heeft betrekking op de situatie dat de twee partners samen al drie verschillende kleuren hebben geboden. De partner die nu aan de beurt is om te bieden kan de ontbrekende (vierde) kleur dan bieden, zonder de natuurlijke betekenis. Dus zonder dat het speelsterkte in die kleur toont. De betekenis is beperkt tot de boodschap dat de bieder 'iets' heeft dat een volgbod rechtvaardigt. (nl)
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  • Fourth suit forcing (also referred to as fourth suit artificial; abbreviated as FSF or 4SF) is a contract bridge convention that allows responder to create, at his second turn to bid, a forcing auction. A bid by responder in the fourth suit, the only remaining unbid suit, is artificial indicating that responder has no appropriate alternate bid, remains interested in the potential for a game contract and asks opener to bid again to show additional features. Opener responds to the fourth suit forcing by (in prioritised order): 1. * Raising responder's first bid suit with 3-card support, 2. * Bidding notrump with values in the fourth suit, 3. * Raising the fourth suit with four cards in that suit, 4. * Making the most natural rebid possible, lacking any of the above. Fourth suit forcing is minimally forcing for one round and usually forcing to game - partnership agreement is required. Whether or not the convention is applicable if the fourth-suit bidder is a passed hand is also a matter of partnership agreement; there is no consensus amongst experts on the options as to its use being non-forcing, forcing, or forcing only after a reverse. It requires an invitational hand with at least 10 points, or 12-13 upwards if it is game-forcing and opener has not shown any extra strength. The convention was introduced by the British bridge author Norman Squire and is adopted by the majority of partnerships playing at competitive levels. Useful with strong game-going hands where responder has no natural forcing rebid, it is a type of game try bid. Corollary to fourth suit forcing One of the negative inferences of fourth suit forcing is that all other simple jumps by responder at his second turn are invitational and not game forcing. In the unopposed sequence 1 club -- 1 heart -- 1 spade: a jump by responder to two no-trumps, three clubs, three hearts or three spades are all invitational and not forcing. They suggest 10-12 HCP. Conversely, going through 2 diamonds, the fourth suit, lets you make any of those calls at your next turn and have the call be forcing. Fourth suit by a passed hand Entirely different considerations apply when the fourth suit bidder is a passed hand. Since the bidder is limited in strength through failure to open, he cannot force his partner to keep bidding, but the fact that opener has rebid at all says that opener is either very shapely or has more than minimum values for an opening bid. Opener may pass a bid of the fourth suit. If opener continues with 2NT, which will show values, responder is expected to raise to 3NT with nothing more, by way of shape, to show. Opener will generally pass a rebid in responder's second suit, knowing the hand opposite is very shapely and weak. With ill-fitting hands, lacking game going values, a bid in the fourth suit will often allow the partnership to subside in a playable contract in a reasonable fit, at the two-level. See example 3. (en)
  • In het kaartspel bridge kunnen de speelpartners een conventionele afspraak maken over een vierde kleur forcerend bod. Dit heeft betrekking op de situatie dat de twee partners samen al drie verschillende kleuren hebben geboden. De partner die nu aan de beurt is om te bieden kan de ontbrekende (vierde) kleur dan bieden, zonder de natuurlijke betekenis. Dus zonder dat het speelsterkte in die kleur toont. De betekenis is beperkt tot de boodschap dat de bieder 'iets' heeft dat een volgbod rechtvaardigt. Dit bod is dan forcerend omdat het meestal niet de bedoeling is om deze vierde kleur te gaan spelen. Omdat het een forcerend bod is, is het vaak ook relatief sterk. Het voordeel hiervan is dat alle andere beschikbare biedingen niet meer forcerend hoeven te zijn en dus slechts een zwakke of limiterende betekenis kunnen krijgen. (nl)
  • Czwarty kolor – brydżowa konwencja licytacyjna autorstwa Normana Squire'a, jedna z najpopularniejszych i najbardziej znanych współczesnych konwencji. Typowa sekwencja czwartego koloru to rebid przez odpowiadającego w drugim okrążeniu licytacji nowego, jeszcze nie licytowanego koloru - w powyższym przykładzie 2♥. Czwarty kolor jest odzywką sztuczną i forsującą, zazwyczaj pokazuje brak zatrzymania w zalicytowanym kolorze i prosi partnera o dalszy opis jego ręki. Spotykanych jest wiele ustaleń dotyczących tego jak forsujący jest czwarty kolor (na jedno okrążenie, do końcówki) oraz używane są różne schematy odpowiedzi z zależności od używanego systemu licytacyjnego. (pl)
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