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Slam Bidding in Bridge

A slam in bridge is bidding and making 12 tricks and a grand slam is bidding and making all 13 tricks.

This next hand might be the most famous slam hand of all. It's featured in the movie Moonraker and the evil Drax isn't happy sitting East when James cooly makes 7♣ with the North and South cards.

grand slam in bridge

Grand Slam for North and South. Nice, very nice.

Slams don't come around as often games or partscores and the score for making a slam is high so it can take some time to feel confident with 6 and 7 level contracts. Slam bidding is fun, though, so we've put some ideas together to get you started.

How to bid a slam

You may have heard that you need to learn some special ace asking convention before you can bid a slam but it's really much simpler than that. All you need to do is figure out your partnerships' combined strength, just like you do when you're thinking of bidding a game.

Points needed for slam in bridge

up to 24 points = partscore
25 - 32 points = game
33+ points = slam

When you are considering bidding game the thing you really want to know is if you have enough overall strength. Generally, 25 points is enough to give your side a fair shot at making game. There's no guarantee that you'll make game with 25 points but you'll make it often enough that it's worthwhile bidding with that strength.

The first thing you need to figure out when you are thinking of bidding a slam is what your sides' combined strength is, just like you do when you're bidding game. How many points do you and partner have? Don't be tempted to leap into ace asking until you've worked out if you have enough points or overall strength for slam. Aces come later. In fact, if you have enough points for slam then you'll probably also have enough aces.

So how do you know how many points your partner has? It's simple! You just stick to basic bidding technique. It's the early rounds of bidding at low levels that are the key to successful slam bidding.

Limit bids

Limit bids show an exact point range and shape and are the cornerstone of all natural bidding systems. A 1NT opening bid is an example of a limit bid. For Standard players that shows 15-17 points and balanced hand. For Acol players it's 12-14 points and balanced. It's easy to know how high to bid when your partner makes a limit bid. You simply add your points to partner's and calculate the total. That total tells us whether to bid game, slam or stay in a partscore.

easy slam bidding

Slam bidding is easy!

On the hand above, South's 1♠ bid paves the way to slam. 1♠ is a change of suit so it's forcing. That means North can't pass and is expected to describe his hand further which he does, in this case, with 2NT. That 2NT bid is a limit bid showing 18-19 points and a balanced hand. South has 15 high card points with good shape together with North's 18-19 making 33-24 between the two hands. North must have at least 2 spades for the 2NT bid so South can be sure of an 8 card trump fit. 33 points and 8 trumps - that's slam!

But don't we have to ask for aces? Nope. How many aces are you missing? There are 40 points in a pack of cards so with 33 of them your side can only be missing 7 points. Two aces equals 8 points. You can't be missing two aces.

Asking for aces too soon or even at all is the one thing that leads to more missed slams and more slams going down than anything else. Use basic bidding technique, the stuff you learned at beginners' lessons to work out your combined strength. That's how you bid a slam.

Hand Evaluation

Points alone are a big help in determining your partnerships' combined strength but there are other things to consider.

Trump fit

If you have a good trump fit then you'll often be able to make slam with 30 or even less combined points.

Fitting Cards

How well your honour cards are working together makes a big difference. In the following hand, South has the K and J. Those cards are likely to combine well with North's shown diamond suit.

slam bidding in bridge

South loves those diamond honours!

Slam Bidding Conventions

Knowing your bidding system well and good hand evaluation will get you to most good slams and keep you out of the bad ones. Once you've determined your overall strength, you might need to check that you're not missing two aces.

Blackwood in bridge, 4NT asking for aces, is a convention useful for slam bidding when you're likely to end up in a suit contract.
Gerber in bridge, 4♣ asking for aces, is a convention useful for slam bidding when partner's last bid was 1NT or 2NT.
The quantitative 4NT bid in bridge is used when you have a strong balanced hand and you're not sure if your combined strength is enough for 6NT.

Slam Bidding Practice Hands

Try these hands and videos to practice your slam bidding.

An example of using Blackwood to stay out of a slam missing two aces.
Game Slam or Grand Slam
Big hands are always fun!
@Graeme. In your informative video on bidding slam, specifically the second hand utilizing Gerber, the response to 4C shows two aces, so with three the bidding goes to 6D. But what if the two aces are in Cs and Ds? Immediate chagrin if the opposition attacks So what say you. Is this not the situation in which you need to know the specific ace? Although not the subject of this video, perhaps cue bidding would be appropriate. I guess I am uncomfortable asking the wrong question when the answer can blast me past an opt out level and forces the partnership into an unnameable slam. Thanks
@graeme. Sorry, the above post should read “attacks spades”
nmein says:
Hey @graeme, there is a typo on this page. "South has 15 high card points with good shape together with North's 18-19 making 33-24 between the two hands." Should be "33-34 between the two hands".
Delta says:
Great examples tku.
(2c)-(2d)-2h-4nt 1430-6h 7h 22+7pts made 13 yippee
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