[32519]

johnu, on 2012-March-31, 11:57, said:

I don't understand your numbers. Besides that, you seem to be assuming that every time you could use crawling Stayman you are improving your expected value. Overall, 2NT is a far better contract than 3 of a major on a 4-3 fit when you don't find a 4-4 fit. Finding a 4-4 major fit when you are 4-4 in the majors is supposed to be about 52%, so you'll end up in 4-3 fit (or less) about 48% of the time.

My simulations on Dealmaster Pro show that the gains you have from finding a good 4-4 fit are approximately offset by the losses you have when you end up in a 4-3 fit. And if opener has a 2=2-4-5 or 2=2-3-6 semi balanced hand with minors, you won't even have a 4-3 fit to play. You also have a loss when you can't use Smolen.

Puppet Stayman was created to allow a 5-card major within your 2NT range. Why would you want to allow 2245 or 2236 minor suit orientated hands in your 2NT range and still play Puppet Stayman? For sure I see no need for Crawling Stayman anymore when responder holds a bust.

With a 2245 or 2236 minor suit orientated hand opposite a bust, you now face the risk of the opponents running both of your 2-card suits?

[32519]

A lot of numbers are starting to form part of this thread. Allow me to add some more why I believe Puppet Stayman is unnecessary.

22.56% = The probability of responder being dealt 5M(any)(any)(any) and 5-20 HCP (a positive response)
32.02% = The probability of responder being dealt 5+M(any)(any)(any) and 5-20 HCP (a positive response)
00.08% = The probability of opener being dealt 5M332 and 20-21 HCP.

Just looking at the numbers, anyone other than top flight players, gain little through adding to the memory load on a 0.08% probability that opener’s 2NT contains a 5-card major. Without transferring into responders 5-card major suit immediately you start adding additional bids into your Puppet sequence to “right side” the contract at a higher level (that is if your Puppet sequence contains such bids).

I will be extremely surprised if non top flight players continue with PS.

[1eyedjack]

32519, on 2012-April-01, 02:35, said:

00.08% = The probability of opener being dealt 5M332 and 20-21 HCP.

Something looks a bit off here. Surely the question to pose is what is the pobability of opener being dealt 5M332 GIVEN that he has 20-21 (or whatever) points AND is known to be any 4333 or 4432 or 5332 (or perhaps 6m322 or 5422)
That has to be considerably more than 0.08%. I am more inclined to believe Campoy's 15%. And then my question remains unanswered: the chance of responder having precisely 3 card support will reduce that somewhat to a meaningful figure for the purpose of deciding whether it is worth devoting resources.

[campboy]

1eyedjack, on 2012-March-31, 13:11, said:

I am interested. Of those 15.8%, what proportion find a responder with precisely 3 card support, and fewer than 4 in the other major?

I assume you meant "4 or fewer" rather than "fewer than 4" since that is what seems to matter.

My program doesn't do two hands at once, but so long as you don't care about responder's pointcount it's easy to calculate. Once you fix opener's hand with 5 spades (say), the number of hands for responder with 3 spades and h hearts is
⁸C₃*^13-kC_h*^18+kC_10-h (out of ³⁹C₁₃ total hands)
where k is opener's heart length. When k=3 there is a 26.1% chance of 3 spades and <5 hearts; when k=2 it is a 23.8% chance. k=3 is twice as likely as k=2 so the overall probability is 25.3%.

Putting those two figures together, you miss a 5-3 major fit on less than 4% of 2NT openers by not having puppet available. On some of the hands we've included here responder will not bid puppet anyway, either because he is too weak or because he judges 3NT will be the best spot even if there is a 5-3 fit. It is also possible that he will decide to bid something else on some minor-oriented hands.

[1eyedjack]

you are right i meant 4 or fewer. thanks

[32519]

32519, on 2012-March-30, 00:42, said:

I looked up the frequency of occurrence of typical 20-21 HCP NT hands. This is what I found: The probability of being dealt –
1. 5332 and 20-21 HCP = 0.08% (5-card major, minor 5-card suits excluded)
2. 4432 and 20-21 HCP = 0.08%
3. 4333 and 20-21 HCP = 0.12%
......Total.............................= 0.28%

1eyedjack, on 2012-April-01, 03:19, said:

Something looks a bit off here. Surely the question to pose is what is the pobability of opener being dealt 5M332 GIVEN that he has 20-21 (or whatever) points AND is known to be any 4333 or 4432 or 5332 (or perhaps 6m322 or 5422)That has to be considerably more than 0.08%. I am more inclined to believe Campoy's 15%. And then my question remains unanswered: the chance of responder having precisely 3 card support will reduce that somewhat to a meaningful figure for the purpose of deciding whether it is worth devoting resources.

I don’t have DealMaster Pro. I am using BBO’s deal generator. Setting up the hand specifications in BBO’s deal generator: Minimum / Maximum as follows –

5S / 5S
2H / 3H
2D / 3D
2C / 3C
20 HCP / 21 HCP

The “Odds” gives me a 0.04% probability of being dealt such a hand. So I need to double this figure for the other major, which gives me my 0.08%. I can improve this % slightly as follows –
5S / 13S
2H / 13H
2D / 13D
2C / 13C

The “Odds” now improve to 0.08%. So I need to double this figure for the other major, which now gives me a 0.16% probability of being dealt a hand containing a 5-card major and 20-21 HCP. This slightly improved % is skewed by the fact that the 5-card major may in fact now be a 7-card major.

[campboy]

32519, on 2012-March-30, 00:42, said:

1. 5332 and 20-21 HCP = 0.08% (5-card major, minor 5-card suits excluded)
2. 4432 and 20-21 HCP = 0.08%
3. 4333 and 20-21 HCP = 0.12%
...Total.........................= 0.28%

#1 is right. #2 is wrong; it should be 0.24%. #3 is right. The total is wrong both because #2 is and also because you didn't include 5332 hands with a 5-card minor and those are still automatic 2NT openers.

[blackshoe]

32519, on 2012-April-01, 02:35, said:

I will be extremely surprised if non top flight players continue with PS.

Then you will be extremely surprised. <shrug>

[Wackojack]

32519, on 2012-April-01, 02:35, said:

Just looking at the numbers, anyone other than top flight players, gain little through adding to the memory load on a 0.08% probability that opener’s 2NT contains a 5-card major.

I will be extremely surprised if non top flight players continue with PS.

Simply not true. If you look up the suit probability distributions, you will see that the probability of getting a 5332 distribution is 15.5%. Therefore the probability that this will be a major suit 5332 is half that i.e. 7.75%.
Now look at all balanced distributions:
P 4333 = 10.5%
P 4432 = 21.5%
P 5332 = 15.5%
Total = 46.5%

Thus the extra chance of getting a major 5332 distribution given that you have opened 2NT = 7.75/46.5 = 16.7%

So if you believe that you need to find out if partner has a 5 card major, then it occurs for 16.7% of all 2NT opening bids. Very well worth it.

[awm]

You're not really using the right measure for memory here. For example, I'm sure the use most people put 2NT-3♠ to (typically some kind of minor suit slam try) are much less frequent than puppet stayman. Yet I don't find any even semi-serious partnerships that leave that 3♠ bid wholly undefined.

Puppet is only a little more complicated than regular stayman (which has a lower frequency-of-use actually, since you usually need a 4M to use it), and it's in a place where most people play methods. It's not like Lebensohl or transfer advances of overcalls (for example) which "look like natural bids" and could be easy to forget (and thus might not be worth playing except that they are very frequent and also very useful).

I just don't think "memory load" is a big concern with regard to puppet stayman. Personally I don't play it when it's my choice (will play it if partner insists), but that's because I don't think it's a good method, not because it's hard to remember.

[johnu]

32519, on 2012-April-01, 01:58, said:

Puppet Stayman was created to allow a 5-card major within your 2NT range. Why would you want to allow 2245 or 2236 minor suit orientated hands in your 2NT range and still play Puppet Stayman? For sure I see no need for Crawling Stayman anymore when responder holds a bust.

With a 2245 or 2236 minor suit orientated hand opposite a bust, you now face the risk of the opponents running both of your 2-card suits?

What would you bid open with something like:

---

I don't know anybody in my bridge circles who would open anything except 2NT if it shows 20-21. The fact that you open a semi-balanced hand like this with 2NT is unrelated to whether you decide to play puppet Stayman. It doesn't seem like a good idea to base your bidding system on partner having a bust

[phil_20686]

johnu, on 2012-April-01, 16:22, said:

I don't know anybody in my bridge circles who would open anything except 2NT.

Really? Not know many strong club players?

But seriously, this thread seems to have argued about ridiculous things. Who cares about frequency? It is your expected gain that matters, and the fact is that the big gain from puppet stayman is when responder has a 3 card major and a singleton and you find a 53 fit when its a better spot than 3N. That is not uncommon.

Running out to a better partscore by playing garbage stayman is a joke surely? I mean I have basically given up non-forcing auctions after 2N. You either pass it or you go to game, because every sequence after a 2N opener is valuable, and having NF bids cuts down the number of ways I can describe my hand.

The big loss of puppet stayman is that it becomes much more difficult to make slam tries in your 4-4 major fit. After 2N-3c-3d-3H showing 4S, partner bids 3N so you discover that your fit is actually hearts, and there are no bids left for making a slam try. If you shoehorn 4m in as a slam try then you are giving up bidding with 4M5m or 4M6m hands in a natural way. You also have to find something else to do with the 54 major hands. These are not massive losses but they do cost.

I mean, in general slam hands are less frequent than game hands, but you still need system for them. If you limited yourself to never bidding slams PS is obviously a win, as you basically never prefer to play in 5m rather than 3N when partner is 20-22 balanced, so I could use those bids for my extra major hands.

The idea that I might want garbage stayman is just LOL.

[32519]

Wackojack, on 2012-April-01, 11:28, said:

Simply not true. If you look up the suit probability distributions, you will see that the probability of getting a 5332 distribution is 15.5%. Therefore the probability that this will be a major suit 5332 is half that i.e. 7.75%.
Now look at all balanced distributions:
P 4333 = 10.5%
P 4432 = 21.5%
P 5332 = 15.5%
Total = 46.5%

Thus the extra chance of getting a major 5332 distribution given that you have opened 2NT = 7.75/46.5 = 16.7%

So if you believe that you need to find out if partner has a 5 card major, then it occurs for 16.7% of all 2NT opening bids. Very well worth it.

Simply not true. These figures are for a 0-37 HCP range which you obviously cannot use. Go to BBOs deal generator and fill in the hand constraints and calculate the “Odds” of being dealt each hand type.

My Last Puppet Post
Let us close shop on the Puppet Stayman discussion here. Enough has been said. The pro Puppet camp will continue playing it. The anti Puppet camp isn’t likely to start playing it now. The undecided have enough information to make their decision into which camp they want to fall.

[campboy]

Wackojack, on 2012-April-01, 11:28, said:

Now look at all balanced distributions:
P 4333 = 10.5%
P 4432 = 21.5%
P 5332 = 15.5%
Total = 46.5%

Thus the extra chance of getting a major 5332 distribution given that you have opened 2NT = 7.75/46.5 = 16.7%

So if you believe that you need to find out if partner has a 5 card major, then it occurs for 16.7% of all 2NT opening bids. Very well worth it.

The reason that this figure is wrong is that pointcount is not independent of shape. Hands with very high (or low) pointcount are likely to be flatter.

(There is also the issue that 10.5+21.5+15.5=47.5 as well as the fact that to guarantee 1dp accuracy in your final answer you need rather more accuracy in your initial figures. You should get 16.3% for 0-37 as opposed to 15.7% for 20-21.)

[Vampyr]

phil_20686, on 2012-April-01, 17:00, said:

The big loss of puppet stayman is that it becomes much more difficult to make slam tries in your 4-4 major fit. After 2N-3c-3d-3H showing 4S, partner bids 3N so you discover that your fit is actually hearts, and there are no bids left for making a slam try.

It's not ideal, but you can play that 4♥ is now a slam try, if 4♥ the round before would have been 4-4 majors with no slam interest. You have no room below 4♥ obviously, but it's better than making your intentions clear with 5♥!

(This is what I play but I have no idea whether anyone else plays it or has considered it, so I apologise if I have missed something and the above is ridiculous).

[Dark Widow]

phil_20686, on 2012-April-01, 17:00, said:

The big loss of puppet stayman is that it becomes much more difficult to make slam tries in your 4-4 major fit. After 2N-3c-3d-3H showing 4S, partner bids 3N so you discover that your fit is actually hearts, and there are no bids left for making a slam try. If you shoehorn 4m in as a slam try then you are giving up bidding with 4M5m or 4M6m hands in a natural way. You also have to find something else to do with the 54 major hands. These are not massive losses but they do cost.

In most versions of Puppet this 3♥ rebid denies 4 hearts so there is no need to make a slam try in hearts now. A simple solution is to play that 4♣ over 3♦ is a slam try with both majors. With a hand that wants to make a slam try in clubs you start with 3♥ and then bid 4♣ next time around. You lose this as a cue bid for spades of course. Over 4♣ there are several possibilities, to name but one example: 4M as natural declining the slam try, 4♦ as accepting the slam try and either agreeing spades or with a double fit, and 4NT (and up) as key card responses accepting the slam try and agreeing hearts. Over the 4♦, 4♥ asks and then 4♠ agrees spades and 4NT (and up) are 6 key card responses with the double fit.

If you play a version of Puppet where 3♦ does not promise a 4 card major then you obviously need follow-ups to cater to this. In that case it is probably best to use 4♦ as a general no fit flag, something like 4♦ = no 4 card major, 4M = fit + decline slam try, 4NT = spades and accept slam try, 5♣ (and up) = key cards with hearts and accepting the slam try.

To make slam tries in the 4-4 fit when Responder does not hold both majors is not a problem at all in Puppet. For spades: 2NT - 3♣ - 3♦ - 3♥ - 3♠ - 4♥ is surely unambiguously a slam try, while for hearts Opener can preemptively signal readiness over 3♠ (= hearts) by bidding 4♣, while a simple 4♥ would be a decline of the (imaginary) slam try.

[32519]

In this thread, Rainer Herrmann asked, Minors over 2NT: Do you have good agreements?

If you still haven’t been convinced to dump Puppet Stayman, the post below has been copied in from the above thread.

Minors Over 2NT: Do you have good agreements?

Rainer Herrmann:
This thread of yours appears to have stumped the panel of posters. I have no idea if this has happened before. A handful of people have offered a bidding sequence for the actual hand posted. Thus far, no one has offered a TOTAL GOOD AGREEMENT as suggested in the thread title.

My own bidding agreements over 2NT have a much greater focus on the majors. I’m guessing that other regular posters are guilty of the same error as myself. You have opened up a hole in my bidding structures which I am diligently working on to plug.

What are my objectives over 2NT? I still want to be able to retain as many as possible of the following:
1. Stayman / Garbage Stayman / Crawling Stayman
2. Jacoby Transfer Bids
3. Smolen (both 5/4 and 6/4 holdings)
4. Minor Suit Stayman / 4-Way transfer bids. As I cannot have both, once I have managed to plug the hole in my bidding agreements, it will become evident which one gets dumped.
5. The ability to show 5/5 in the minors with no slam interest
6. The ability to show 5/5 in the minors with slam interest
7. The ability to sign off in 4 of a minor with a minor suit bust
8. The ability to transfer into a minor suit single suiter and then continue with slam exploration with the appropriate hand
9. Texas / SA Texas in my current agreements will need to go to make room for 5-8 above. This will be accommodated via Jacoby Transfer Bids followed by a raise to game. I still need to decide exactly what I will use the 4♣ and 4♦ bids for now.
10. Gerber has long ago been dumped in favour of a quantitative 4NT

I am already facing some creative thinking to restructure my current agreements to accommodate all of the above. I am now asking this for the third time; how do you also include Puppet Stayman in amongst a very scarce resource i.e. available bidding space? To complicate this jigsaw puzzle even further; I need to be able to cope with opposition interference.

To keep on insisting retaining Puppet Stayman on a 0.08% probability of opener holding such a hand seems even more ludicrous when the probability of responder holding a minor suit orientated hand is considerably higher. A full two levels of bidding space has been consumed before the partnership can even begin exploring for the best spot.

Here are some more probabilities coming from BBO’s deal generator:
0/3 ♠
0/1 ♥
0/13 ♦
0/13 ♣
0-20 HCP = 3.24% X 2 = 6.48% (to include the other major as well)

0/2 ♠
0/2 ♥
0/13 ♦
0/13 ♣
0-20 HCP = 5.09%

That is a total probability of 11.57% of responder being dealt a minor suit orientated hand opposite a 0.08% probability of opener being dealt a 20-21 HCP hand containing a 5-card major.

Go figure!

[Statto]

The probability of being dealt an opening hand of 20-21 HCP is 0.6%. So it would actually seem that in 13% of those cases opener has a 5-card major. Now you go figure

[32519]

Statto, on 2012-April-22, 00:56, said:

The probability of being dealt an opening hand of 20-21 HCP is 0.6%. So it would actually seem that in 13% of those cases opener has a 5-card major. Now you go figure

If you’re unhappy with the numbers I am quoting, effectively you’re questioning the integrity of the numbers being spat out by BBO’s deal generator.

[glen]

Normal Stayman makes no sense when you can be playing half puppet at almost no cost:

3♦: no four card major
3♥: 4/5♥s, can be 4-4 in the majors
3♠: 4♠s, denies 4♥s
3NT: 5♠s

The question then is how much complexity to add to finding either five card major?