Gambling 3NT Opening: Responses, Acol Version and Examples

A gambling 3NT opening shows a long, solid minor suit: seven or more cards headed by the ace, king and queen, with no ace or king outside it. Partner passes when the other suits are covered and runs to four or five of opener's minor when they are not.

The name says it all. Opener bets that partner can stop the other suits, so that the minor runs for seven tricks and two more come from partner's hand. It is a common treatment on 2/1 Game Force and Acol cards, and it is one of the few openings that is both a preempt and a real attempt at game. Below: the hand you need, every response, the Acol version, two worked deals and how to defend against it.

A typical hand:

♠82 ♥74 ♦95 ♣AKQJ863

1. A solid minor: at least seven cards with the ace, king and queen. Partner must be able to count seven tricks with no help.
2. Nothing outside: no ace or king in the other three suits. A side queen or jack is allowed.
3. Usually no four-card major, so a 4-4 major fit is not lost.

The "nothing outside" rule is what makes the bid work. Because opener cannot hold a side ace or king, partner knows the exact shape of the deal: seven tricks in the minor, about zero elsewhere. Partner then judges whether the other suits are safe.

With a side ace or king, or a broken minor such as AQJ10xxx, open three or four of the minor (or one of the minor with opening values) instead. Many pairs relax the outside-honor rule in third or fourth seat, where the preempt matters less and the chance of game matters more.

Responder does not know which minor opener holds, but often works it out from his own hand: if you hold a high diamond honor, the suit is clubs, and the other way round.

The common 4♦ scheme: opener bids 4♥ or 4♠ with a singleton or void in that major, 4NT with 7-2-2-2 (no shortness), and five of his own minor with shortness in the other minor. Some pairs swap the 4NT and five-of-the-minor answers, so agree which.

The 4♣, 5♣ and 6♣ bids are all "pass or correct". Responder does not need to know the suit; opener corrects if it is diamonds. With a weak hand and support for both minors, 4♣ or 5♣ also works as a further preempt, depending on vulnerability.

South has 14 points, the ♠A, the ♦A and ♥KQ. The long minor must be clubs, because South's two small clubs leave room for it and South's ♦A rules out an AKQ diamond suit. Seven clubs plus two aces make nine tricks, and every side suit has a stopper or a strong holding. South passes.

Double dummy, 3NT makes exactly nine tricks, while 5♣ takes only ten. This is the deal the convention was built for: two hands with no fit in the classic sense, 24 points between them, and a game that a natural auction would struggle to reach. Note also how little East and West learned: East has to lead blind into a hand nobody has described.

Here South holds a weak hand with no stoppers, say ♠J753 ♥9864 ♦J2 ♣1072. If South passes, East and West will run their major-suit tricks against 3NT. South bids 4♣, pass or correct. North has diamonds, so North bids 4♦ and South passes.

South's ♦J adds nothing, and there is no reason to go higher. If South had four-card support and a singleton somewhere, 5♣ (pass or correct) would be the stronger preempt, especially at favorable vulnerability.

The gambling 3NT has a long history in British bridge, and players searching for "Acol gambling 3NT" usually want to know whether it differs from the American version. Mostly it does not.

• The original form, sometimes called the strong gambling 3NT, required opener to hold stoppers in at least two side suits as well as the solid minor. Responder then passed far more often. You still meet it, so ask.
• The modern form, taught in today's Acol books, is the one above: a solid minor and no outside ace or king.
• Acol's 3NT rebid is a different bid. After 1♦ - 1♥ - 3NT, Acol opener shows a long running minor with values outside, not a gamble.

Whichever form you play, write it on the card. The strong version wants responder to pass with almost anything; the weak version wants responder to count stoppers.

In 2/1 and Acol alike, a balanced 25-27 no longer opens 3NT. With a strong 2♣, it opens 2♣ and rebids 3NT after 2♦.

It reaches nine-trick games. A solid seven-card minor plus two side stoppers from partner is a cold 3NT that a natural auction often misses, because opener has too few points to open one of a suit.

It preempts. The opponents must start at the four level, and they do not know what opener holds outside the minor.

It describes the hand in one bid. Partner knows almost exactly what opener has.

The costs are real. 3NT is often played by the wrong hand: opener declares, so the opening lead comes through responder's stoppers, and a holding like Kx in dummy may be worth nothing. The opponents may also double 3NT and run a long suit. Some partnerships use other openings (for example 3♠) for the solid-minor hand to fix the wrong-siding problem. For most players, the simple gambling 3NT is still worth it.

Opener has seven fast tricks in the minor and nothing else, so the defense must take its tricks at once.

1. Lead an ace. Seeing dummy before the second trick usually tells you which suit to run. Declarer is not hiding side winners: opener has none.
2. Double for penalty with a strong hand. If you hold stoppers in the minor or a long running suit of your own, a double tells partner you want to defend.
3. Overcall a long suit at the four level if you think your side has a game or a good save.

When you sit South over a gambling 3NT opened by East, the same logic applies: count the tricks the opponents can take before you get in.

To see what the robots expect, see what 3NT means in every system on the free bid meaning page. Related reading: preempts in bridge, the strong 2♣ opening, Gerber for notrump slam auctions, notrump in bridge, and the full list of bridge opening bids.